A story about Mika facing her sins and fighting for her happiness. This series is divided into two parts. ーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーー Part 1: Why Mika Misono Is Not Allowed To Be Happy When Mika learns that Sensei is heading to the beach with Koharu and the others (during the event "In Search of Hidden Ruins ~Trinity Extracurriculars~"), she begs him to let her tag along. Excited, she hums a tune as she opens her locker to get ready, only to find her swimsuit cruelly destroyed inside. In that instant, she realizes that a wretched sinner like her has no right to be happy. In tears, she messages Sensei to call off the trip. After receiving her text, Sensei realizes something must be wrong and rushes to her side... Part 2: Why Mika Misono Is Allowed To Wear A Swimsuit Mika arrives at the beach alone with Sensei. They share a blissful time together, but as the day fades into evening and night, Mika begins to question if she really deserves to feel this happy, eventually withdrawing into herself. Will she be able to confront her sins and her guilty conscience... and finally find happiness? ーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーー Translated by Zetsu and Pyre