The two share a very close relationship and are shown to care a lot about each other's personal lives.

Taichi is sometimes worried why his sister seems to know more about love than he does. In addition, Taichi is very protective of Rina and seems to suffer anxiety any time he believes someone is interested in his younger sister. During the Nise Random arc, Rina claims to have a boyfriend who is three years older than her in middle school and a horrified Taichi demands she break up with him. Rina also heavily relies on her brother to do most chores for her, and Taichi teases that she will be a bad wife. Boyfriend: Rina's apparent boyfriend who is a third year in middle school, three years older than her.The two frequently talk over the phone and Rina is left bored if she is kept from speaking with him. Taichi is uncomfortable about his sister being in a relationship, and becomes very anxious anytime the two interact. Her boyfriend is always very busy with his club activities and, as a result, usually does not have time to go out with Rina on the weekends. Himeko Inaba: In Asu Random, Rina considers Inaba a rival, fearing that she will take Taichi away from her.The two do not get along and are prone to bickering with one another. The first time they met, they had a fight that Taichi does not like remembering.

When Inaba visted, Rina interrogated Inaba about their relationship as if she was their mother-in-law. Then they had a debate on whose bond with Taichi is stronger but did not have a conclusive ending. Aoki Yoshifumi: Rina and Aoki have met a few times in the past when Aoki would come over to Taichi's house to hang out.She at one point believed Aoki and her brother to be in some sort of relationship.

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