At last Haruki realives Kazuma's true feelings, but while he's confused at this sudden turn of events he can't hide his joy that the girl he loved best likes him too.
That has nothing to do with me.
Das hat nichts mit mir zu tun.
Eso no me importa.
Lo dices como si yo... 
tuviera algo que ver...
Je ne vois pas ce que 
j’ai à voir là-dedans.
Não é da minha conta.