矢島 真琴

The protagonist's older sister. Beautiful but short tempered. An office worker. The protagonist also calls her Makoto-nee-chan.

She's basically capable, so her frustration with her unreliable younger brother boils over. She ends up being harsh. She comes up with extreme ideas to “raise him into a proper man.”

Despite being popular, she has no interest in dating guys—she's basically has a big brother complex. Is her strictness just love in disguise?

From official site]