Tantei Kibukawa Ryousuke Jikentan 'Nakanai Irainin'

Please save my friend!
One day, an elementary school student with a school bag on his back visits the Kibukawa Detective Agency.

This time, the case was handled by assistant detective "Sagishima Izuna" and scenario writer "Ikurumi Masao",
The story begins with a small request from a small client.

The story goes that they have just gone to deliver a letter to a friend who has suddenly decided to take a day off from school because he is sick,
He saw his friend staring at him through the window.
He felt an unusual atmosphere at the sight of his friend and rushed to the office, hoping to catch a straw.

The case gradually changed its appearance and eventually developed into a horrific murder case...

[From Steam]