Baka Dakedo Chinchin Shaburu no Dake wa Jouzu na Chii-chan - Ep.1

The main character is a chubby kid named Coe, who lives alone because his family has some problems. While walking down the street, he met his classmate. After a short conversation, they started a romantic relationship, which, rather quickly, turned horizontal. The boy can be understood, because this girl is very beautiful and slutty, and also has an impressive chest. How will this couple end their summer vacation?