Yuuki Mizuho is the main female character in the game and the OVA. In fact, most of the OVA is based on her and her friend Miko.

She seems to be a popular character in Uzuki Gakuen, her school. In the OVA, when a couple of girls found out that Tooru was living at her house, a gossip spread like wildfire. She is also a top tennis player.

Mizuho does not have a big role in the TV Serie, yet, she appears as a supporting character in several episodes. It is difficult to compare her in both TV Serie and OVA, because of that. Being such a cheerful character, it makes her my #3 favorite.