Sanaru

What Sanaru does

Sanaru Co., Ltd. (株式会社さなる) is a privately held, family-owned Japanese comprehensive education company founded in 1965 in Hamamatsu, Shizuoka Prefecture, by Sato Isaku. The company operates a multi-brand network of directly-managed K-12 tutoring schools—including Sanaru Yogakko (佐鳴予備校), Keimeikan (啓明館), Mishima Shingaku Seminar, Chuman Gakuin, School 21, Joho School, and Kyudai Shingaku Zemi—serving approximately 60,000 enrolled students across 12 prefectures plus Tokyo, with 1,211 regular employees as of FY2025. Sanaru's stated target is to grow enrollment to 200,000 students by 2035.

The company's core offering combines in-person group instruction (集団指導) and one-on-two individual tutoring (さなる個別) with a proprietary in-house technology stack: the See-be electronic blackboard system (co-developed with NHK Educational Corporation and recognized on METI's "Future Classroom" portal), AI Gakutore (AI-powered adaptive learning evolved from a 2006-patented predecessor), and the @will video lecture platform (666 courses, 21,884 lectures). The group also operates an internal publishing arm that has sold over 200,000 copies of self-developed textbooks and reference materials, and maintains a Dalian, China office dedicated to overseas educational materials production.

Sanaru generates revenue primarily through recurring tuition fees collected per semester/term for group classes, individual instruction, and seasonal intensive courses, supplemented by one-time sales of self-published educational materials and subscription-based @will video learning subscriptions. The integrated "RISE" circular business model (R&D → content production → marketing → ICT deployment → teaching operations) keeps all major functions in-house, supporting the company's recruitment-marketing strength—ranked #1 in the Rikunabi education industry ranking for three consecutive years (2024–2026). FY2025 group revenue stood at ¥23.7 billion (¥23,721,060,000).

Name

Sanaru

Legal name

株式会社さなる

Website

https://sanaru.jp

Company type

Private

Founded year

1965

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Sanaru is a privately held Japanese K-12 education company operating directly-managed tutoring schools across 12 prefectures plus Tokyo under multiple brands, serving approximately 60,000 students with proprietary ICT tools including the See-be electronic blackboard, AI Gakutore adaptive learning, and the @will video platform.

Ownership category

akta.pro rank

Product category

Supplementary K-12 Education (Tutoring & Exam Preparation)

NAICS

Exam Preparation and Tutoring (611691), Educational Support Services (611710)

SIC

Services-Educational Services (8200), Services-Prepackaged Software (7372)

akta.pro primary industry

K–12 Core Curriculum Small-Group Tutoring Centers (Math/ELA/Science/Social Studies) (EDANAHAA)

akta.pro secondary industries

Academic Tutoring Services (Subject-Specific & General) (EDAJALAA), Virtual Test Prep & Online Supplemental Instruction (K–12) (EDAJADAI), Adaptive Learning & Personalized Instruction Software (EDAJAMAE)

Keywords

• K-12 tutoring services
• Exam preparation
• Supplementary education
• Video-based learning
• Educational publishing

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices10 records

Markets served

GTM type

B2C

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Tutition fees — Group and Individual Instruction: Core revenue from tuition fees charged to students for group classes (集団指導) and individual/personalized instruction (さなる個別). The company offers year-round courses including regular semester courses (本科コース), exam preparation courses (入試対策本科コース), seasonal intensive courses (春期・夏期・冬期講座), and specialized programs such as Sanasta for lower elementary and @will for high school exam prep. Revenue is recurring (collected per semester/term). The group has 60,000 enrolled students across its network, generating group-wide sales of ¥237.2 billion.
2. Publishing and Educational Materials Sales: The company publishes textbooks, reference books, and educational content. Self-developed materials include original textbooks (さなる式テキスト), mock exams (サナル模試 / 静岡県進学模試), and published educational books with cumulative sales exceeding 200,000 copies. The company also operates a materials sales division selling these resources externally (外販).
3. Video-based Distance Learning (@will): Video lecture courses for university entrance exam preparation, available through the @will platform. Delivered via tablet and online platforms. Contributes to revenue as part of the integrated service offering.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels8 records

Core offering

Sanaru provides K-12 supplementary tutoring and entrance exam preparation services through directly operated classrooms across 12 Japanese prefectures and Tokyo, serving over 60,000 students. The company delivers group instruction and one-on-two individual tutoring, supported by proprietary in-house technology (See-be electronic blackboard, AI Gakutore adaptive learning, @will video lectures) and self-published educational materials, with the goal of holistic character development alongside academic achievement.

Product overview

Sanaru operates as a comprehensive education company offering a multi-brand portfolio of tutoring and learning services. The core offering centers on Sanaru Yogakko (佐鳴予備校本館), providing group instruction enhanced by proprietary systems including the See-be electronic blackboard platform and AI Gakutore (AI学トレ) personalized learning management. Supplementary offerings include individual instruction (さなる個別) with 1:2 teacher-student ratios, and the @will video learning system with over 21,000 lectures. The company has expanded through strategic acquisitions including Keimeikan (中学受験), Mishima Shingaku Seminar, Chuman Gakuin, Kyudai Shingaku Zemi, School 21, and Joho School, collectively serving over 60,000 students across 12 prefectures under brands such as Sanaru, 啓明館, 三島進学ゼミナール, 静岡進学ゼミナール, 中萬学院, スクール21, and 九大進学ゼミ.

Differentiator

Problem solved

Functional benefit

Brands

• See-be: 自社開発の電子黒板システム。NHKエデュケーショナルと協力のもと2003年に本格製作開始。
• @will（アット・ウィル）
• サナスタ
• AI学トレ
• RISE

Products and services

• Sanaru Yogakko (佐鳴予備校) Core group instruction brand of Sanaru, providing classroom-based tutoring for elementary, junior high, and high school students across Shizuoka and Aichi prefectures, featuring the proprietary See-be electronic blackboard system.
• Sanaru Individual (さなる個別) One-on-two personalized tutoring service where one teacher guides up to two students through individualized learning plans; positioned as a complement to group instruction.
• @will (アット・ウィル) / High School @will Self-developed comprehensive video-based university entrance exam preparation platform featuring 666 courses and 21,884 lectures covering high school curriculum from foundational to ultra-elite university entrance exam levels; delivered via tablet and online channels.
• Sanasta (サナスタ) Lower elementary school (Grades 1–4) specialized learning program combining group instruction and dedicated curriculum to build foundational academic skills and a love of learning.
• Keimeikan (啓明館) Tokyo-based elite junior high school exam preparation school serving the Tokyo metropolitan area; operates under the Sanaru Group umbrella as an acquired brand.
• Mishima Shingaku Seminar (三島進学ゼミナール) Shizuoka Prefecture-based tutoring school serving local K-12 students; operates as an acquired brand within the Sanaru Group.
• Chuman Gakuin (中萬学院) Kanagawa Prefecture-based established tutoring school serving the Greater Tokyo area; operates as an acquired brand within the Sanaru Group.
• Kyudai Shingaku Zemi (九大進学ゼミ)

Quantifiable outcome

• 4名全員が佐鳴予備中生 — 静岡県内から東大理Ⅲに現役合格した4名すべてが佐鳴予備中生という実績
• +2 more outcomes

Named customers1 record

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Two partnerships are on record, tiered notable.

• NHK Educational Corporation (NHKエデュケーショナ儿)notableStrategic or Co-development PartnerNHK Educational Corporation collaborated with Sanaru in the co-production of the See-be (シー・ビー) new classroom teaching system in 2003. NHK provided educational content expertise and broadcasting-grade production capabilities that enhanced the quality and credibility of the teaching system.
• 経済産業省 (Ministry of Economy, Trade and Industry — METI)notableStrategic or Co-development PartnerThree Sanaru-developed systems — See-be, High School @Will, and Sanasta — were selected for inclusion on METI's 'Future Classroom' (未来の教室) portal site in January 2022 (令和2年1月). This government endorsement validates the quality and innovation of Sanaru's ICT education tools.

Scale indicators8 records

Recent moves10 records

Expansion highlights6 records

Direct peers

• Sundai (駿台予備校): Major Japanese university entrance exam prep chain with strong high-school and elite-university focus. Comparable to Sanaru in its university-admissions coaching and structured classroom model.
• Waseda Academy (早稲田アカデミー): Listed Japanese K-12 prep school chain with similar small-group classroom instruction across Tokyo metro regions. Closely comparable to Sanaru in scale (~¥20B-class revenue) and target demographic of university-bound students.
• Kawaijuku (河合塾): One of Japan's largest K-12 university entrance exam prep chains with both classroom and video-based delivery. Closely comparable to Sanaru in core group instruction across elementary, junior high, and high school test prep.
• Yoyogi Zemi (代々木ゼミナール): National K-12 and university exam prep chain with classroom and video-based delivery. Comparable to Sanaru in university-entrance coaching and integrated regional coverage.
• Meiko Gijuku (明光義塾): Japan's largest individual (1:2) tutoring franchise network. Comparable to Sanaru's さなる個別 individual-instruction offering, with similar target demographic and per-session pricing model.
• Kizuna Gakuin (希学園): Kansai-region K-12 prep chain with similar elite-prep outcomes orientation (Todai/Kyodai admits) and proprietary teaching/ICT systems. Comparable to Sanaru in 'best education' positioning and small-group delivery.
• Nichinoken (日能研): Specialist Japanese K-12 prep chain focused on elite private/junior-high entrance exams. Comparable to Sanaru in core subject focus and exam-prep positioning, but narrower in demographic.
• Toshin High School (東進ハイスクール): Major Japanese high-school exam prep chain, part of Nagase Brothers, with a hybrid classroom + satellite + online offering. Comparable to Sanaru in student demographic and high-school exam-prep focus.

Broad incumbents

• Kumon (公文教育研究会): Global K-12 supplementary education franchise focused on individualized self-learning worksheets. Adjacent rather than directly competitive with Sanaru's group-classroom model, but addresses the same families.
• Benesse Holdings (ベネッセホールディングス): Largest Japanese education conglomerate with K-12 publishing, correspondence courses, and prep-school subsidiaries. Overlaps with Sanaru in student segment but operates across a far broader portfolio including publishing and school operations.

Market position

Strengths5 records

Weaknesses4 records

Competitive moat6 records

Key risks5 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/@sanaru-saiyou
• Instagraminstagram.com/sanaru_saiyo?utm_source=ig_web_button_share_sheet&igsh=ZDNlZDc0MzIxNw==
• TikToktiktok.com/@sanaru_saiyo

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries7 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sanaru