Tsukimizuki Rikai no Tantei Satsujin - Vol. 3 Ch. 11 - Debunk

[MangaDex]

 

[deathmailrock]

This seemed so obvious that I was really hoping they wouldn't go this route... either he was the killer or he's pretending to be the killer and his mom did it...

 

[Hollow7F]

imma stick with my theory, now time to see how it ends