Harumurasaki (春紫)

Thirty-year-old Mizuki is single and having the worst birthday ever—her boyfriend cheated on her. After drowning her sorrows in alcohol, she’s unexpectedly proposed to by Soichirou—a university friend and coworker who's stood by her for ten years. Uncertainty turns to fluttering heartbeats as Mizuki’s friend becomes so much more. https://www.cmoa.jp/title/309643/

What is the truth hidden behind the bizarre incidents unfolding in a world where the laws of humanity and the supernatural run rampant? The long-awaited manga adaptation of the sensational mystery-horror freeware game!! (Source: ComicWalker, edited)