株式会社YAGO

株式会社YAGO (YAGO, inc.) is a Tokyo-based company whose stated business is the operation of "classmall kids" (クラスモールキッズ), an online programming school for children. Courses are built around games children already play: Minecraft-based tracks using MakeCode block programming and in-game commands, spanning six courses from preschool (年少・年中 knowledge-building course) through block programming beginner/intermediate, command programming beginner/intermediate/advanced, and a game programming course from 4th grade; and a Roblox track teaching 3D game development in the Lua language. The company describes the target span as preschoolers through high school students on its corporate site, while the school site frames the core audience as kindergarten-age (年長) through elementary students.

Classes run online over Zoom in small groups of up to three students per instructor, 50 minutes per session, once a week, with 44 lessons provided per year (some months reduced to three sessions, e.g. during summer holidays). Supported devices are Windows PCs, Macs, iPads and Chromebooks; Nintendo Switch and Fire tablets are not supported, and Minecraft Education accounts are supplied by the school rather than purchased by families. Make-up sessions can be rebooked from the student's My Page, and students can move up to higher-level courses at promotion points. Alongside continuing courses, the company runs seasonal intensive programs such as SPRING CAMP 2025 and SUMMER CAMP 2024/2025/2026, four-day online camps that in 2026 added Roblox and AI courses.

YAGO previously operated classmall (クラスモール), an online lessons marketplace offering live Zoom classes such as yoga, Pilates, ballet, dance and cooking, sold per session without monthly fees; that service ended in April 2025. Earlier company material also references a reservation-calendar and payment service called YAGO, released in August 2020, with online payments handled through Stripe.

Founding story

The company was founded on 2019-08-13 by Takafumi Inoue (井上 貴文). Inoue graduated from the Faculty of Law at Kwansei Gakuin University and joined Rakuten as a new graduate, working in the Rakuten Ichiba business and the president's office on new business development and an overseas subsidiary posting. In 2014 he developed the flea-market app Rakuma and led the business; company profiles also cite oversight of Rakuten's C2C business and the 2016 acquisition of Fril, and a 2017 move to AnyPay as representative director heading the payments business. He founded YAGO in August 2019 and also teaches at ClassMall Kids under the name "たか先生".

Business model

Direct-to-consumer paid online classes. Continuing courses are sold as recurring subscriptions billed by credit or debit card, with automatic renewal unless a suspension or cancellation request is made at least 10 days before the course end date; no pro-rated refunds are given. One-off sessions, seasonal camps and free trial classes are also offered. Tuition varies by course, starting from 16,940 yen per month including tax.

Monthly tuition for continuing courses (from 16,940 yen tax-included per month), plus fees for single sessions and seasonal camp programs; payment is by credit or debit card only (VISA, Mastercard, JCB, AMEX, Diners), charged on the first class date for credit cards.

Traction

The school site reports, as of March 2026 and based on internal figures, more than 10,000 cumulative students, a 90% one-year continuation rate and 95% of reviews rated 4 or higher. Published student reviews cover SUMMER CAMP 2026 courses from August 2026. A startup database records a total of 100 million yen raised in a February 2021 financing and, as of 2025-11-27, an estimated post-money valuation (including potential shares) of 647 million yen at Series A.

Latest developments

On 2026-06-10 the company announced SUMMER CAMP 2026, a four-day holiday intensive that added Roblox and AI courses alongside Minecraft. On 2026-07-17 it launched the "Roblox Booster Course", a continuing course for students from 4th grade covering full 3D game development in response to Roblox's popularity. A representative and the head of curriculum development also published a video discussing the 2026 summer camp in June 2026.