相馬七海

Nanami is a girl that lives next door to the Kumotani family, and is good friends with Chizuru. Being at least two years younger than Yuuta, Nanami still has many things to learn and understand ahead of her. As she is something of a slow learner, Chizuru at one point was tutoring her in math and English. Sadly, after Chizuru's parents went away, there was no one to help her keep up in school until Yuuta came along. [From Moroboshi Yuumei's review.]