Away from the bustling city streets lies a quiet snack bar called "Serina," run by a charming mama named Serina Tachibana. She enjoys lively conversations with her customers, but once the workday ends, she reveals her deeply erotic side as usual. For drunken guests, she performs blowjobs right at the counter, and she gives new employees thorough sex training beyond just their job duties. She has a deeply perverted side, switching into an entirely different persona. When her first love visits the bar, memories come flooding back, leading to intense, passionate sex right inside the shop. Serina Tachibana's allure captivates every single customer who walks into Snack Serina.