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"Maybe I've been waiting for such a moment for a long time!" While being estranged by his daughter and being blamed by her wife, middle-aged office worker Iwashita lived modestly in his own way. This was his norm at least until he met a girl, Shiina, who suddenly appeared one day in front of him. She approached Iwashita as a 'customer' for "a meal for 20,000 yen". A story of a small escape begins with a painful and dazzling 15-year-old girl seeking her own value and a 40-year-old middle-aged man struggling between reason and desire.
Gomi Jirou, a 29-year-old virgin, has spent the past 9 years nerding out with his work colleagues about anime during lunch and drawing erotic doujinshi at night so he can masturbate. However, one day, this comfort zone of his is thrown into disarray by the introduction of a new colleague, Yumezora Kuroko, a bespectacled beauty with long, dark hair and a massive chest. It only takes a moment to fall in love, just like how it takes a moment to lose your footing. This is the story of a weak man's sins and sexual fixations.