“Why is a there a cat... in Isagi’s bed.”

Rin Itoshi’s idiot roommate has managed to turn into a cat.

Isagi Yoichi, Rin’s current roommate in Blue Lock who was supposed to have left for a training camp, has turned into a cat. And Rin has no idea.

I’m gonna say that this takes place at some point after the U-20 World Cup? There’s an upcoming game let’s say against Costa Rica. And currently the Blue Lockers are training in preparation. However Isagi was invited to a training camp in Germany, but on the night before his flight, he mysteriously turned into a cat.