杏

An is the older of Boku's twin sisters. Boku refers to her as the "non-cheeky", demure younger sister. She in turn calls him Ni-niichan.

An and her sister Aki joined Boku's family when their mother married our protagonist's father. Unlike the rest of her family, Ann has not given up on our protagonist, and for the most part worries that he's not responsible enough to take care of himself and do what he's supposed to do. Thus, after Boku fails the university exams the first time, An decides to move in with him to make sure he studies and goes to cram school. An is also the only person in Boku's family that respects and encourages his skill as an artist.

This is not to say that she'll let him get away with anything, though. In fact, An is actually very strict when it comes to sticking to duty, and has been known to get angry if Boku strays from the "true path". When she finds out that Boku is working for MoonEarth, she jumps on board and becomes the studio's manager. This leaves sche****ng, budget planning and such in her hands.

As would be expected of a non-blood-related sister, An is infatuated with our protagonist.