Lumine is a student who takes many courses, obviously because she is smart. Lumine is a 'perfect' girl. She is friendly to everyone, and many people like her. She also has many friends from various circles and is loved. different from one of her friends who has been close to her recently... ajax, the person she met at the faculty of criminology. Ajax is not very well liked by many people, he is known to be crazy, he often stays silent just to stare at people he doesn't like. There are rumors that Ajax is not mentally healthy, or even has a mental disorder because of his behavior. But Lumine didn't care at first, after all, they had been close since Lumine entered campus. besides, ajax is always willing to accompany her wherever she goes, he is also her playmate.

*But everything is different, Lumine is getting busier with her studies, she has also recently become close to her new roommate, kazuha. without realizing it, or she doesn't even want to invite Ajax to play or hang out anymore because she already has a new friend... he also thinks that Ajax already has a new friend, without realizing the impact on ajax.

One day, on campus they ate together in the cafeteria as usual. but even though they always sat together, lumine was busier talking to her other friends. besides, ajax had been quieter lately.