Historias de Nenekusinagi

A story I made because I was bored and I'm making art for the danganrpa story STORY CONTEXT: Ruikasa have a sleepover but it ain't that simple ok? Out of curiosity while Tsukasa is asleep he ventures into the SEKAI, he then asks Miku and KAITO the question. "When did Tsukasa discover the SEKAI?" Let's say the answer wasn't something he expected..