Trainee killer Ahn Eun-young receives her first mission to become a full-fledged killer. The mission is to kill So Si-ho, a boy from the same class who transferred a few months ago. Eun-young pulls the trigger with trembling hands, but... This target is not ordinary...?
The mysterious library committee senior, Uzuki Chiriko, has a peculiar habit. That habit involves dragging her junior, Makoto Matoba, into her unusual stress-relief methods. With her unpredictable and thrilling ways of venting stress, Makoto\'s mind is constantly in turmoil!? A bold and fearless stress-relief comedy about a senior who\'s way too pent-up!