Shigatsu Youka

Set in modern-day Japan, the story follows three high school girls as they uncover the terrifying secrets of a serial killer and the mysteries lurking behind the gruesome crimes.

In April, when cherry blossoms flutter through the air,
a gruesome discovery is made—a blood-soaked corpse in a quiet town.
The news spreads like wildfire across TV, the internet, and social media.
The reason? This wasn’t the first time such a horrific event had occurred.
What once felt like a distant story seen only on screens now has "something" lurking dangerously close to them.

[From Steam]

Remake of the doujin game Shigatsu Youka with new characters and significant plot changes.