"You can grope my boobs but... Only 10 times." --"There's a concert that I really want to go to, so let me stay over." That is what childhood friend, Mayu, said when coming to his house. This being the first time seeing each other since graduating high school, she grew up a bit but... Her big boobs haven't changed. Having work the next day and finding her a nuisance, Takahiro who was set on having her leave tells her "If you let me grope your boobs, I'll let you stay." Even with a red face, she surprisingly replied with OK... The reply was unexpected but thinking once he groped her a little she'd definitely leave, so Takahiro came from behind... Gently rubbing Mayu's large boobs. Mayu gradually let's out sweet moans and climaxes once her nipples are caressed. Mayu has acquired her right to stay for "today." However, from tomorrow she doesn't have a place to stay. In order to stay at Takahiro's house for longer, their actions go into overtime.