Lying mii-kun and broken maa-chan: precious lies manga

Lying Mii-kun and Broken Maa-chan: Precious Lies summary:

The setting is a rural city in which kidnapping and series of murders are happening simultaneously. 8 years ago, a boy and a girl were kidnapped and brutally tortured by the hands of their perpetrator. The victims, the compulsive liar "Mii-kun" (the narrator), and "Maa-chan" (Misono Mayu) reunite and start living together, despite the fact that the recently reported missing children were within Mayu's apartment...