 If you liked
Iris Zero
|
 ...then you might like
Umineko no Naku Koro ni Chiru - Episode 7: Requiem of the Golden Witch
|
Iris Zero/Toru are quite similar to Umineko Ep7/Will and, to a lesser degree, Ep5/Battler. In both manga/sound novels, the three characters place great emphasis on the motive, the whydunnit of the mystery/crime. They "don't forget about the heart" of the culprit and try to figure it out even after knowing the whodunnit and howdunnit rather than just giving up from the start and waiting for a confession from the culprit.