Syouko Osanai is the protagonist of the yuri video game Aoi Shiro.
A student at Seijou Academy. Her nickname is "Osa". She's the well-liked, ace of the kendo team who takes on the role of captain after the former 3rd year captain retires. Since she is the serious and hardworking type, she often gets teased and is on the receiving end of jokes.
- A few days into the jendo club training, she finds Nami, a girl washed up on the shores near the location of the training camp who can not speak and doesn't seem to know much about herself.
- She kissed Yasumi Aizawa on the lips.
- She can be attached and affectionate to Nami.