 If you liked
Usotsuki Mii-kun to Kowareta Maa-chan: Totteoki no Uso
|
 ...then you might like
Kimi ni Koisuru Satsujinki
|
the two manga are similar in the sense of how toxic the relationship is between the two main characters, both stories feature a severely mentally disturbed couple in which the partners reinforce each other's negative traits. While the story of Mii-kun and Maa-chan focuses more on the psychological aspect, Kimi ni Koisuru Satsujinki also adds some gore into the mix.