@Jeikob I've been thinking that too since the ending of chapter 3.5 but I feel a little better after seeing the Mom in the colored spread in this chapter
They better not make the little sister a romantic interest it just makes the story all messy. I'm pretty sure everyone wants class pres to win anyways.
@otb I was referring to the novel, if I remember correctly decapitating them was Sansui's decision. He wasn't asked to do it.
@primrosea tell that to the author I was just going by what's in the novel