Toilet-bound Hanako-kun 5

When Nene is invited by enigmatic playboy Natsuhiko to a sketchy yet oddly enjoyable tea party, she meets Hanako-kun's "girlfriend" and his "little brother"...?! On top of that, she learns that one of her classmates might actually be a School Mystery, but she doesn't know who! Hanako offers to help -but just how far will he go to lure this supernatural out of hiding?