Hoshi no Isan 星の遺産

Children of the JAXA Legacy — a Japanese space visual novel

Future

Hoshi no Isan
星の遺産

Pre-production. Design, lore, and ship documentation exist — but this is not in active daily development. Planned after the Physical ROC program and The Lab content channel are established. Day-to-day build work lives in The Lab; this page is the concept archive.

A Japanese-aesthetic space visual novel and crew RPG set aboard the Yamabiko — a JAXA Heritage Ship and living museum of Japan's most extraordinary space missions. Walk every corridor. Know your crew. Carry the legacy forward.

Game Design Document Explore the Ship

"The ship is not just where the story happens. The ship is the story. Every compartment is a shrine. Every crew member is a descendant."

Japan's space program produced some of the most remarkable engineering stories ever told. Spacecraft that refused to fail. Missions that waited years for a second chance. Almost none of these stories have been told in gaming.

Hoshi no Isan puts you aboard the Yamabiko — crewed by the children and grandchildren of Japan's greatest space pioneers. You are their commanding officer. Lead them. Know them. Earn their trust.

Visual Direction

Interior Look & Feel

Inspiration only — not final assets. These images suggest the mood, lighting, and walkable compartment style for the Yamabiko. Production interiors will be built in Blender and UE5 as the project enters active development.

Heritage corridor

Compartment atmosphere

Lived-in ship space

Core Experience

Three Ways to Inhabit the Ship

🚶

Walk Every Corridor

Explore the Yamabiko in first person. Mission-named compartments, interactive plaques, artifacts, and ancestor shrines. The ship reveals its stories to those who look carefully.

Explore the Ship
💬

Know Your Crew

Six crew members — each a descendant of a real JAXA pioneer. Visual novel conversations in specific rooms. Trust unlocks ancestor biographies, story arcs, and new spaces.

Meet the Crew
✨

Collect the Legacy

A gacha system where every crew member carries real historical lineage. Recruiting means inheriting a person — their skills, their story, their ancestor's unfinished mission.

Crew System (GDD)
Real JAXA History

The Missions That Built the Yamabiko

Every compartment aboard the ship is dedicated to a real JAXA mission — not inspired-by stories, but the actual missions and their perseverance.

🛸
JAXA · 2003
Hayabusa — The One That Refused to Die
Seven years. Two billion kilometers. A single functioning engine. It came home.
Hayabusa Engine Bay
🌑
JAXA · 2014
Hayabusa 2 — The Perfectionist
Deployed rovers, fired a bullet into an asteroid, returned samples — then kept going.
Science Laboratory
🌕
JAXA · 2007
Kaguya — The Poet
First HD footage of Earth rising over the lunar surface. Named after the moon princess.
Observation Lounge
☁️
JAXA · 2010 / 2015
Akatsuki — The Patient One
Failed engine. Five years. Tiny thrusters. One second chance at Venus. Taken.
Meditation Room
🌙
JAXA · 2024
SLIM — The Precise One
100-meter lunar landing accuracy. Engine failed. Landed inverted. Mission completed.
Navigation Bridge
🌍
JAXA / ISS · Ongoing
Japanese ISS Legacy — The Bridge Builders
Wakata, Hoshide, Noguchi, Mukai, Mohri. Five pioneers. Centuries of orbit between them.
Heritage Gallery
Full Mission Archive
Crew Gacha System

Children of the Pioneers

Each crew member descends from a real JAXA legend. Recruit them. Earn their trust. Unlock their ancestor's story.

★★★★★

Hana Mukai

Medical Officer
Granddaughter of Dr. Chiaki Mukai
★★★★★

Kenji Mohri

Science Officer
Grandson of Dr. Mamoru Mohri
★★★★

Yuki Wakata

Navigation
Daughter of Koichi Wakata
★★★★

Ren Hoshide

EVA Specialist
Son of Akihiko Hoshide
★★★

Sora Noguchi

Historian
Granddaughter of Soichi Noguchi
★★★

Hayato Itokawa

Ship Engineer
Lineage: Hayabusa Team
Meet the Full Crew
From the Source

JAXA Latest News

Recent press releases from Japan Aerospace Exploration Agency — the real missions that inspire the Yamabiko. Links open on the official JAXA website.

All press releases at JAXA
Design Archive

Concept Documentation

Written when Hoshi was the primary site focus — still valid as design reference for a future production phase.

The Yamabiko: JAXA Heritage Ship

Mission-named decks and environmental storytelling for the heritage ship concept.

  Read Article

Introducing Hoshi no Isan

The original direction announcement — universe framing and design intent.

  Read Article

Ship Interior Design

Multi-deck layout and modular interior philosophy — overlaps with current Lab work.

  Read Article

Explore the Concept

Full game overview, ship pages, and the complete design document — preserved for when this project enters production.

Game Design Document   The Yamabiko
Active work: The Lab     All Projects