Mirei Yajima (矢島 美怜 Yajima Mirei) is one of four new members introduced in Genshiken Nidaime. Like the other members, she is a fujoshi, though she is more inept at drawing manga than others. She is best friends with Rika Yoshitake, and the two are often seen with one another. Rika usually addresses her as "Yajimacchi."
Although her artwork isn't up to par with Ogiue's and Hato's, Yajima has a gift for writing comedy and has been praised for it from her fellow club members.
Yajima is stocky, overweight, and is generally seen with a grimace on her face. She dressed in gender neutral clothes and has never made an attempt to look feminine. Though Yoshitake comments on how large her breasts are, Yajima claims they're merely from her fat than from development into womanhood.
Yajima is reserved and somewhat shy. Though she has a grimace on her face, it's actually hard to predict what's actually running through her head. Since the arrival of Hato, Yajima has suddenly become self-conscious of her own feminine identity and becomes envious of him, though she will not openly disclose her thoughts. She respects the feelings of others, and will often reprimand her friend Yoshitake for pushing too far into people's comfort zone. This, however, does not change her inquisitiveness on whether Hato is truly a girl or boy, and she has been known to act against her own better judgement.