Shota, who is not good at studying or sports, is always bullied by bullies. One day, on his way home after being bullied as usual, a mysterious girl who calls herself "Tsubomi" appears. With the help of her father, who is happy to accept Tsubomi for some reason, Tsubomi ends up living with Shota's family. Tsubomi struggles to reform Shota into a strong boy, but Shota is always interested in erotic things... This is Shota's world, with a different setting than usual, featuring the mysterious girl "Tsubomi".