>guy adapts a random child who has no blood connections to him
>gives up his job
>his love life
>any chance of having children for himself
>he basically lives for her
>she realizes this when shes grown up and falls in love with him
Is this the greatest love story ever told?
His grandfather took Rin in because her mother, who had a side job as a home aide for him, couldn't take care of her. The story of him being Rin's father was just made up to explain why he would take her in.
"He" didn't NTR but the girl did. Rin was the one to force the decision on him like a child. You don't have to like the story but don't make shit up. If anything Rin started to fall out of love for Koki's retarded decision to fuck the other girl. No shit Rin started to look at other men, ie her adopted dad. Everyone starts capping on old Daikichi but no one bats an eye for Koki when he fucks up.