Group doubaku-system4

(C63) [MGW Uni Matrix One (Isou Doubaku)] Bridgex (Guilty Gear XX)

(C52) [DOUBAKU SYTEM (Isou Doubaku)] TRUE LOVE MAGIC FIRST STEP 1.2 (True Love Story)

(C53) [DOUBAKU SYTEM (Isou Doubaku)] Isou Doubaku Sakuhinshuu WORKS (Various)

[Doubaku System Ginza Taimeiken (Various)] Choutoppatsu! Mizutani Fan Book Ver 1.2 (Dousoukai)