My best guess would be that when he first got his powers he accidentally left his own body as a spirit, and was pronounced dead. Then he got back into his body and his sister thinks it's not him?
This pisses me off as much as the ending to the original Inuyasha anime. I was a student when it was airing on Adult Swim and the final episode was basically just, "Kagome hurt her feet with acid. Find out what happens in the manga. Later bitches."
I was so angry about it that I, to this day...
This gyaru goddess has 0 foresight. If MC shows up to school with tits the size of the red balls outside Target. I think her friends might have some questions to ask. lol
This prince made the D-Tier villain mistake of gloating before he won. Now he has no excuse. He could've kept his cushy life if he was only smart enough to do this all from the shadows.
That last page. After she calls out a Japanese name and speaks in what I'm assuming is Japanese. His reaction is "She didn't fall for me, but something inside me."
That something inside him could easily be someone's soul. I don't think it's that far of a leap considering how the chapter ended.
And by "Your mother will take care of it" she really means, "Your mother will make a fool of herself and our family name. Possibly to the point of losing our nobility."