After graduating from a university in Tokyo, the protagonist returns to his hometown to start working at a local company, choosing to settle down with family and familiar surroundings. He's greeted by his father and his older sister, who he hasn't seen in over a year and a half. While catching up, he notices that his sister has become more laid-back and even a bit of an otaku, collecting various toys and records.
As they reconnect, the protagonist is reminded of his virginity — a fact that doesn’t escape his sister’s notice. She takes it upon herself to teach him everything he needs to know, starting with the basics of intimacy. From touching and tasting to using different kinds of toys, she guides him through each step with a mix of playfulness and expertise. She introduces him to the world of adult toys, showing him how to use them, how to enjoy them, and how to take full advantage of the sensations they bring.
As the night progresses, the protagonist becomes more and more excited, exploring new levels of pleasure with his sister’s help. The two of them take turns giving each other pleasure, using toys, touch, and even a little bit of competition. The bond between them grows stronger as they share moments of intimacy, laughter, and even a bit of teasing.
The journey through pleasure doesn’t end there — it continues into the morning, with the protagonist still feeling the aftereffects of their fun. He's left in awe of his sister’s knowledge, her confidence, and her ability to make even the most basic things feel like an adventure.
In the end, he realizes that returning home was more than just a change of scenery — it was a chance to learn, to grow, and to experience something truly special with the one person who has always been there for him.
