Mukai Naoya is in a relationship with Saki Saki, but another girl, Mizuse Nagisa, asks him out. He makes the unthinkable decision of asking them if they would be up for both dating him at the same time.
But that just makes it 
even more unacceptable!
!لكن هذا يجعل الأمر غير مقبول أكثر
Aber das macht es nur noch schlimmer!
c’est pas une raison !
Ma proprio per questo non posso accettarlo!
Mas exatamente por isso que não pode!
Но как раз поэтому я не позволю!