P is being blackmailed by Chieri to stay at her room, lying to Mayu about taking a leave of absence due to family matters. Chieri claims to be confining him to "save" him from Mayu, when really she's become just as obsessed as Mayu.
Only thing better than one yandere is TWO yandere. This is all Mayu's fault anyway, after all that taunting.
Base +10, hikori +6, Derk36 +11, huangduanzi +5, seeker555 +8
This will either end with School Days's style ending, or the two of them will just end up competing on who'll be able to make him the happiest, via sexual intercourse or otherwise.