Serio Japan

What Serio Japan does

Serio Japan (株式会社セリオ) is an Osaka-headquartered, privately-held operator of three integrated business lines targeting working women and families in Japan: (1) the Sacaso staffing/dispatch brand providing temporary staffing, business outsourcing, and personnel placement services; (2) after-school care for elementary school children, operated across 220 facilities; and (3) nursery/childcare services for infants and toddlers, operated across 68 facilities under the Treasure Kids (licensed) and Angel Kids (small-scale certified) sub-brands. Founded in 2005, the company became a subsidiary of S-Life Partners (then SERIO Holdings) under Senko Group Holdings in June 2016. The three-segment model is intentionally designed around the dual needs of working women — generating employment opportunities via staffing and creating childcare capacity via facility operations. As of May 2020 the company employed 2,649 people (644 full-time, 2,005 part-time) on consolidated revenue of ¥6,948M; it also operates the tiku☆tiku handmade-toy program, which employs disabled workers and supplies proprietary educational content across nursery facilities.

The business model is fee-based and recurring across all three lines: nursery and after-school fees are collected from enrolled families (with municipal public-enrollment processes governing access to licensed daycare slots), while staffing revenue is generated from placement fees, dispatch markups, and outsourcing contracts with corporate clients. Pricing per child and per dispatch placement is not publicly disclosed at the corporate level; each facility publishes its own fee schedule. Geographic footprint spans Kansai (Osaka, Hyogo, Shiga), Kanto (Tokyo, Kanagawa, Chiba), Chubu (Aichi, Gifu), and Hiroshima, with active real-estate scouting for new daycare sites across these regions. Distribution is exclusively direct — the company owns and operates all facilities rather than franchising. Underlying technology is operational rather than proprietary: nursery-management software handles attendance tracking, parent communication, and facility information sharing, and Google Analytics is used for website traffic analysis; no AI/ML, APIs, or partner-facing platform capabilities are disclosed. Competitive positioning rests on integrated service ecosystem, sector-specific regulatory licenses (General Worker Dispatch License 派27-301959, Fee-Based Employment Placement License 27-ユ-300269, PrivacyMark), and a differentiated HR policy stack (125+ annual holidays, telecommuting, staggered hours, fertility-treatment leave, comeback system, 71.6% female management ratio as of March 2026) that supports recruitment and retention in a tight childcare-worker labor market.

Name

Serio Japan

Legal name

株式会社セリオ

Website

https://serio-corp.com

Company type

Private

Founded year

2005

Operating status

Operating

Headcount range

101–250 employees

Short description

Serio Japan operates three integrated lines for working women and families: the Sacaso staffing/dispatch brand, 220 after-school care facilities, and 68 licensed nursery schools, all directly operated across Kansai, Kanto, Chubu, and Hiroshima. It is a subsidiary of Senko Group Holdings.

Ownership category

akta.pro rank

Headquarters

HQ city

Osaka

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2C

Offering type

Services

Cost components

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

Revenue model

1. Staffing/Dispatch Services (サカソ): Temporary staffing and placement services for working women, including part-time dispatch workers. Operated under the Sacaso brand. Revenue generated from staffing fees and placement commissions.
2. After-School Facility Operations: Operation of 220 after-school facilities (as of April 1, 2026) providing after-school care for elementary school children, including public school after-school programs and private school after-school clubs.
3. Nursery/Childcare Facility Operations: Operation of 68 childcare/nursery facilities (as of April 1, 2026), including licensed daycare centers (トレジャーキッドズ保育園) and small-scale certified nurseries (エンジェルキッズ). Revenue from childcare service fees.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels4 records

Core offering

Serio Japan operates three integrated business segments supporting working women in Japan: (1) the Sacaso (サカソ) comprehensive staffing services brand providing temporary dispatch, personnel placement, and business outsourcing for working women; (2) after-school care services operating 220 facilities for elementary school children, including public school after-school programs and private school after-school clubs; and (3) nursery and childcare services operating 68 facilities under the Treasure Kids (トレジャーキッズ保育園) licensed nursery and Angel Kids (エンジェルキッズ) small-scale certified nursery brands for infants and toddlers aged 0-5.

Product overview

Serio Japan operates three main business segments: comprehensive staffing services under the Sacaso brand (temporary staffing, business outsourcing, and personnel placement), after-school child care services with 220 facilities, and nursery school operations with 68 facilities under brands including Treasure Kids and Angel Kids. The company also offers a handmade toy service called tiku☆tiku for use in its nursery schools. The portfolio is structured as a unified service ecosystem supporting working women and children's development.

Differentiator

Problem solved

Functional benefit

Brands

• サカソ（sacaso）: 総合人材サービスブランド。人材派遣・紹介・業務請負を展開。
• トレジャーキッドズ保育園
• エンジェルキッズ保育園
• セリオのおもちゃ箱「tiku☆tiku」

Products and services

• Sacaso (サカソ) Comprehensive Staffing Services Comprehensive staffing services brand providing temporary dispatch (人材派遣), business outsourcing (業務請負), and personnel placement (人材紹介) for working women and general workers seeking flexible employment.
• After-School Services (放課後事業) After-school child care services operating 220 facilities for elementary school children aged 6-12, including public school after-school programs (公立放課後事業), private elementary school after-school clubs (私立小学校アフタースクール事業), and children's experience activity programs (こども体験活動事業).
• Treasure Kids Nursery (トレジャーキッズ保育園) Licensed nursery school brand operating 68 facilities across Japan, providing early childhood education and care services for infants and toddlers aged 0-5 under Japan's licensed nursery (認可保育園) framework.
• Angel Kids Nursery (エンジェルキッズ保育園) Small-scale certified nursery school (小規模認可保育園) brand providing care for children with fewer than 19 enrolled children per facility, complementing the larger Treasure Kids licensed facilities.
• tiku☆tiku Handmade Toy Workshop (セリオのおもちゃ箱 tiku☆tiku) Handmade toy production workshop program creating custom toys used in Serio's nursery schools, supporting child development, promoting disability employment, and reducing workload for nursery teachers.

Named customers2 records

Segments3 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration1 record

Partnerships

Three partnerships are on record, tiered core and minor.

• センコースペースグループホールディングス株式会社 (Senko Group Holdings)coreOthersSerio Group is a member of the Senko Group Holdings. Serio (then SERIO Holdings) became part of the Senko Group as S-Life Partners (formerly SERIO Holdings), which sits under the Senko Group umbrella as a life support company covering childcare, nursing care, health, and lifestyle support services. Senko Group HD is listed on the Tokyo Stock Exchange.
• 花王グループカスタマーマーケティング株式会社 (Kao Group Customer Marketing)minorStrategic or Co-development PartnerCollaboration to introduce a subscription diaper service at nursery facilities, reducing burden on parents at drop-off and reducing administrative workload for nursery staff.
• トキワ印刷株式会社 (Tokiwa Printing)minorStrategic or Co-development PartnerTokiwa Printing donates surplus paper from its manufacturing process for use in craft activities at after-school and nursery facilities, supporting waste material reuse and SDG Goal 12 (Responsible Consumption).

Scale indicators5 records

Recent moves6 records

Expansion highlights6 records

Others

• Pigeon Corporation: Japan-listed manufacturer of baby and childcare products (feeding, hygiene, baby care). Adjacent to Serio's nursery/after-school customer base as a complementary childcare ecosystem participant — not a competitor but a thematic peer serving the same families.

Broad incumbents

• Bright Horizons Family Solutions: US-listed global operator of employer-sponsored childcare centers and early education programs. Comparable business model in operating licensed childcare facilities at scale, providing a benchmark for facility-based unit economics and corporate-childcare contracts that Serio's staffing side could emulate.
• Solasto Corporation: Japan-listed provider of HR staffing, BPO, and childcare-related services. Broad incumbent comparable to Serio's Sacaso staffing business and provides adjacent facility-support and outsourcing services to healthcare and public-sector clients.
• Benesse Holdings: Major Japanese education and childcare conglomerate offering nursery/preschool services alongside broader K-12 publishing and education businesses. Broad incumbent in adjacent early-childhood-education market with deeper capital and brand reach than Serio.
• Recruit Holdings: Japan-listed global HR/media conglomerate operating Indeed, staffing, and HR solutions. Comparable as a broad incumbent in the staffing/dispatch space that competes with Serio's Sacaso brand at the upper end of corporate HR services.

Direct peers

• Poppins Holdings: Tokyo-listed operator of Poppins nursery schools and after-school care programs in Japan. Direct comparable in licensed childcare and after-school facility operations, with similar urban/suburban footprint and government-contract exposure.
• Kids Smile Holdings: Tokyo-listed operator of licensed nursery schools and after-school programs across Japan. Direct comparable in facility-based early childhood education with similar reliance on government-funded enrollment systems.
• Global Kids Company: Japan-listed operator of licensed daycare centers and after-school programs, focused on urban Tokyo metro area. Direct peer in facility-based childcare with overlapping brand positioning and parent demographics.
• JP-Holding: Listed Japanese operator specializing in after-school care (放課後児童クラブ) and certified nursery facilities. Closest direct peer to Serio's after-school vertical (220 facilities) and competes for similar municipal contracts.

Emerging players

• Kids Academy Holdings: Japanese operator of after-school care (学童保育) and educational programs for children. Comparable as a niche after-school specialist but smaller and more focused on supplementary education than full-day care like Serio.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Instagraminstagram.com/serio_hoiku_tikutiku

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 records

Subsidiaries2 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 Serio Japan