one day at school they noticed Sakura was extremely late which wasn't like him at all, and after calling sakura and him just hanging up without many words, they knew that he was probably sick. so after school they got to the store and pick up some stuff to take to sakura, upon arrival they see that the apartment building isn't great in fact it almost looks haunted, nirei notices that these apartments are suited for one person, a sign that Sakura is living alone.

they go up to the door and knock since the doorbell is broken, no answer, Suo sees that the door is unlocked and he steps in

Suo: Sakura? he calls out you in here?

Nirei: Suo are you sure we should be in here...?