Kaa-chan no Tomodachi ni Shikotteru Tokoro Mirareta. THE ANIMATION

Based on the erotic game by Orcsoft Team Goblin. Naoki overheard his mom having an embarrassing conversation about him with his next door neighbor Shiori. Yet even so, he's still looking forward to the next five days. Naoki's close with his mom, but since they live together he sometimes wants to str