"These are Yasu's siblings! They are very polite and nice to their students! They didn't kill you if you fail the test, they will tutor you instead!"
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Mister Sphere is the second math teacher, he's not just like Miss Circle but he will kill you if you make a mess or bothering a student in the classroom.
Mister Eirwen is an ice skating instructor, he can teach you how to ice skating. If you fell off on the ice, he will help you. But if you're skating too fast that makes a student fell off, Mister Eirwen uses his hand like a knifehand strike to knock you off or maybe... kill you.
Miss Yao is a chinese/mandarin teacher, she is the oldest siblings, she's very kind and silly woman, but she will shows her scary face to a misbehave student and smack you in the head with her left arm that got replaced by a ruler.
Mister Harukaze is the japanese teacher, he appears an introvert man or looks kinda pissed but he's being polite/friendly towards his students. But he's gonna cut you in half with his left arm that got replaced by a sword if you are making a mess or bothering in his classroom.
