Houkago is a decent murder mistery that commits a very big mistake that tends to happen in that genre. It startswith an enigmatic scenario, the one you can read in the synopsis, but eventually the resolution of the case is almost entirely mechanical. While most of the time is dedicated to the emotional points the resolution comes from information that was omited to the viewer that leads to solving it as if it were a puzzle and getting an infodump that connects the pieces of information we couldn't have had tied together by ourselves and just explaining motivations that would had been more interesting if we had seen them slowly showing themselves.

Being a very short read (two chapters slowly above 100 pages each) and with a very nice style that lets you diferentiate the characters and see the emotions in their faces beyond eyes changing, I'd say it's a good manga for people that are into the genre. Just don't expect anything actually psychological being dealt with beyond expaining motivations at the end.

It's also extremely low in terms of gore or mature content, just a pair of boobs and some blood, so don't be afraid of getting any sexual violence or other unconfortably edgy things.