Parasite Arc 1

There is no impeccable disguise, every disguise can be seen through. After Scorched Halloween, Saegusa Koichi smells something amiss with regards to Tatsuya and begins to investigate him. As Tatsuya's disguise gets exposed bit by bit, he gets caught between the Saegusa and the Yotsuba, all while trying to juggle between Mayumi and Miyuki.
Warning: Tatsuya will slowly go OOC