Ijichi, Seika

伊地知星歌

Nijika Ijichi's older sister. In their youth, they did not particularly get along. However, following their mother's death and their father's business trips, the bond between Seika and Nijika strengthened, and they grew close.
She owns and manages the live house STARRY, with her family home located in the apartment above.
Seika lacks practical skills and, because of STARRY, usually maintains an incredibly busy schedule. Consequently, her sister handles most of the household chores, such as cooking and cleaning.
Nijika describes her as a "tsun-tsun-tsun-tsun-tsun-tsun-tsun-tsun-tsun-tsun-dere" due to her seemingly cold, tough-love approach toward both Kessoku Band and her sister. Although it is clear that she cares deeply for both, her attempts to show this can be considered tactless. (For example, Seika kept a concert slot open for Kessoku Band even after claiming they were not good enough.)
She was formerly the lead guitarist in a band, stating that she quit due to disinterest. Nijika suggests that Seika opened STARRY for her, recalling how Seika used to bring her sister to concerts when they were younger because of the lack of parental presence; these remain some of Nijika's fondest memories. Seika would never admit this to anyone.
She was Kikuri Hyori's senpai and friend during college, inspiring the latter's interest in rock music. Although always wary of Kikuri—even going so far as to reprimand her (along with Ryo) for borrowing money and failing to repay it within a reasonable time—Seika clearly cares for her, allowing her to use their shower and stay over if needed. She also shares a distaste for Kikuri's drinking habit.

Spoiler

}