Twilight Ethos

Young and beautiful teacher, Yūsei Makoto, is a hidden pervert with a voluptuous body. Despite her alluring attributes, she finds herself unable to use them and spends her days in frustration. However, as she gets caught up in the lascivious events triggered by her students and colleagues, her own reason begins to deteriorate!?

Prequel to Rakujitsu no Pathos where we see the main character's background and get to understand how things came to be….