This is additional content to support the developers, it does not change the gameplay.

DLC includes soundtracks for バインドを解除する(unbind).

DLC contains 4 beautiful tracks.
All tracks in .mp3 and .flac formats.

Tracklist:
01. 綺麗な(aliva) [00:30]
02. もっとください(give_me_more) [02:15]
03. 私のせい(my_fault) [02:19]
04. 男の子 [01:55]

After buy all sounds available in game folder.