He's not attracted to both genders. He literally said Shoichi is the only guy he'll ever fall for so it was moreso he fell in love with Shoichi as a human being and not a male lol
he did put himself in a "box" by saying he was straight kryptid
I agree, he just didn't stop calling himself "straight", like dude you're fucking another dude that's not very straight, doe still he isn't attracted to other males but in the end he still not straight w( ̄△ ̄ ; )w
after re reading this i dont remember such a sad ending