Phew. Don't scare me like that. I guess you're just a little sister.

S1, E6: Phew. Don't scare me like that. I guess you're just a little sister.

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Daimyouzamurai Mei, a transfer student, joins class 1-F. She seems to also have the ability to see and manipulate flags. Meanwhile, class 1-F is split into two groups and goes on a trip to the ocean and forest. Souta is forced to join both trips.