Hoshi no Isan
星の遺産
ほしのいさん
A Japanese-aesthetic space visual novel and crew RPG set aboard a JAXA Heritage Ship — a living museum of Japan's most extraordinary space missions. Walk every corridor. Know your crew. Carry the legacy forward.
Explore the Game Game Design DocumentPre-Alpha — Building in Public
Three Ways to Inhabit the Ship
Walk Every Corridor
Explore the Yamabiko in first person. Six mission-named compartments. Hundreds of interactive objects — plaques, artifacts, crew items, ancestor shrines. The ship reveals its stories to those who look carefully.
Explore the ShipKnow Your Crew
Six crew members. Each a descendant of a real JAXA pioneer. Visual novel conversations happen in specific rooms — trust unlocks ancestor biographies, story arcs, and new spaces aboard the ship.
Meet the CrewCollect the Legacy
A gacha system where every crew member carries a real historical lineage. Recruiting means inheriting a person — their skills, their story, their ancestor's unfinished mission. Not random characters. Heirs.
Crew SystemDevelopment Journal
A solo dev learning Unreal Engine 5 while building a love letter to Japan's space program. Every step documented.
JAXA Latest News
Recent press releases and updates from Japan Aerospace Exploration Agency. Links open on the official JAXA website.
- Feb. 13, 2026 Fundamental Observations from Gaseous and Particulate Emissions Testing of F7‑10 Engine (SAF)
- Feb. 9, 2026 Successful Deployment of Mexican Satellite Gxiba-1, Selected in the Sixth Round of KiboCUBE Programme
- Feb. 3, 2026 Launch Postponement of MICHIBIKI No. 7 (QZS-7) aboard the 9th H3 Launch Vehicle (H3 F9)
- Oct. 24, 2025 Live Coverage: Launch of HTV-X1 aboard the 7th H3 Launch Vehicle (H3 F7)
- Oct. 21, 2025 DLR-ONERA-JAXA Trilateral Meeting held in Osaka, Japan
Follow the Mission
使命を追うHoshi no Isan is being built in public — a solo developer, a love of Japanese culture, and the extraordinary stories of JAXA's space program. JAXA's legacy deserves an audience beyond the mission teams.