Subspace Chronicles Raijin (Japanese: 亜空戦記ライジン)
The year 2734 AD, where one of Earth's 5 subspace navigation spots were suddenly assaulted by mechanical lifeforms called "Galem (ガレム)". To combat the Galem threat, the Galactic Federation developed the mobile robot weapon called "Raijin (ライジン)".
All the stages are polygon fields where the player shoots down enemies while shifting through the Raijin's Land and Flight forms. Clear the stages to earn where during pause intermissions to refill and upgrade weapons.
The mecha used is called Raijin, which can mode change into either its default mobile Land Form (ランドフォーム（歩行形態）) and defensive Flight Form (フライトフォーム（飛行形態）).