Himemiya Tsubaki

A senpai who attends the same school as the protagonist, she is the president of the tea ceremony club.
She recruited the protagonist into her club, which only has a few members.
She is a caring person, but is a bit clumsy. Now that the protagonist, a kouhai, joined her club, she tries to act like a big sister, but her efforts often become fruitless.
She is called "Hime-chan" by her friends.