Successfully complete the game and save when prompted to unlock the Omake options. You can now replay the mini-games and operations that were found during the main game, in addition to looking at gallery images and listening to music tracks. You can unlock all eleven operations in Omake by purchasing that option for 500,000 Ten. To unlock all gallery entries, you must unlock all sixteen epilogues.
Kenshuui Tendo Dokuta 2: Inochi No Tenbin