music: Stack Bros.
from: 雨のささやき - Whisper of the Rain (紅涙)
circle: Crux feat. 暁Records
This is an image song made by Akatsuki Records for Crux's original character 高峰くん (Kouhou-kun). It is featured in their artbook "Whisper of the Rain" which was released on COMITIA122 back in 2017.