[SymphonicRain]

Interestingly, based on the conversation between Alto and Sheryl in episode 9:

Spoiler:

Sheryl never seemed to have attended a school before, thus the one of the reason(s) she applied for Misoshi is that she wanted a taste of a school life. It certainly reflects her past is one that is an isolated kind and likely without friends resulting in her to grow up quickly with a strong independent trait.