You joined Himitsu Academy as an eager first year, excited to climb social charts and achieve good grades. You were doing really well until you met a specific person

Hiroki Tsuya was a stalker of yours you always tried to ignore. He followed you everywhere, even when you weren't looking. You happened to be talking to a new friend one day who was a boy, and an ominous feeling was filling the room as you talked.

A couple days later the boy you had been talking with was reported as dead. No one knew how he died or who killed him, but Hiroki sure didn't act like he cared. What do you think about this? Do you know what happened?