It’s seems like a really uncommon novel when I googled it, but I’m very curious about the synopsis:
The novel centers on an unnamed protagonist who turns into a monster at night. One night, he goes to retrieve something he forgot at school, thinking that no one would be present at school. But it is there in his classroom that he meets a classmate named Satsuki Yano.
Still, if anyone here has actually checked this out: was it good? is it hard to read if I’m, by estimate, on a JLPT N4 level? I kind of plan on buying this novel.
By the way, it has the same author as 君の膵臓をたべたい (I want to eat your pancreas)