Otome wa Boku ni Koishiteru EP3 - When Maidens Choose a Maiden

Mizuho finds out he is in the same world history class with Takako, where they talk and she says that she won't agree to her becoming elder, not knowing that he's a boy. Mizuho is elected elder and Shion collapses after defending the election, making Mizuho rush her to the infirmary.