Teikoku Kagekidan

If only I knew who that was...

Well, since Heaven speaks with authority, it must know...

Cop: cheerful and naive excellent students, virgins, and righteous girls, who regret killing someone and feel guilty.
IMHO!!!

Wow, you managed to name one correct point that unites them, but in the rest, none of them apply to any of those I mentioned. Although, okay, Tyreal is somewhat cheerful, but that's it.