Kou belongs to the photography department, and has been disowned by his family after it was revealed that he likes men. One day Sanehiko's older brother shows a video of Kou playing with a strange man, and then he asks a nasty question.
Utsuro no Shouzou is a completed manga by Nishin Masumi, first published in 2019. It blends psychological, boys' love, crime and horror. You can read all 3 available chapters of Utsuro no Shouzou online for free on MangaPulse; the newest is Chapter 3, added 2020-09-15. The series is finished, so you can read it from start to end in one go.