English education
Apps and books for Japanese learners who find English hard — so learning keeps going because it's fun.
Learn more → Coming soonApparel — UKIYO HOTARU
Clothing that carries the quiet beauty of Japan, for customers around the world.
Learn more → Coming soonMusic — Lumistice Music
Songs by our artist and soundtracks for apps and games.
Learn more →About
About SUN G.K.
Founded in November 2026 by a family of three in Matsuyama, Ehime, Japan.
This English site is a summary. The main site is in Japanese.