>>280118607
Sakiko was still really lost after her mother's passing
She wanted to create a band after seeing Morfonica playing while she's still depressed , Seeing a band like that in an uptight school like Tsukinomori and outside of her upbringing probably reminds her how it feels to play music for other people like she used to do for her mother, also the general feeling of being in a found family and having a place to belong