Ore no Kimochi ga Wakaru ka - Vol. 1 Ch. 6

[MangaDex]

 

[mimicking]

oh...poor girl xC

 

[sukaley]

geez, this feels really unresolved :/

 

[CastleCharms]

Spoiler

I think in the end Shirou is gonna stay with Mio have a family but throughout the years keep Hiro on the side for his violent urges he "can't control" I assume that's what Shirou means by 'curse'