Bananas and Humans

When Suginami is telling everyone about the mysterious places of the school, Sakurai inadvertently mentions the hidden stairs in the principles office. Surprised, Suginami drags Sakurai to the principles office to find the stairs. After going down them, they find a girl in a capsule. Sakurai accidently presses a red button setting off an alarm and waking the girl. Who is this mysterious girl?

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S01E03 - First Lesson