Yami no Ketsuzoku: Harukanaru Kioku/Hidden content

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Sound test

On the title screen, press ← → Ⅱ Ⅰ  RUN . To use the sound test, press ↑ and ↓ to select a sound and Ⅰ to play the selected sound. To exit, reset the system.

Unlock all visual scenes

On the title screen, press ↑ ↑ ↓ ↓ ← → ← → Ⅱ Ⅰ Ⅰ Ⅱ → ← → ← ↓ ↓ ↑ ↑  RUN  (the Konami code entered normally, then reversed). The title will flash to confirm correct entry, and all visual scenes will be unlocked.