tsukkiyama but a n g s t y uhm,, don't expect fluff

Cauchemar( .nm.) : Rêve causant une forte émotion négative, le plus communément de la peur ou de l'horreur, mais également du désespoir, de l'anxiété ou une grande tristesse.

Yamaguchi sends secret notes to his lover, Tsukishima Kei. Tsukishima is having a hard time finding out who the anonymous writer is. Yamaguchi does a good job hiding the fact it's him, Tsukishima might never figure it out. I wonder what happens next.