The protagonist, Kirishima Ryuki, became an adult a few days ago. When he went to the river with his friends, he stripped off his clothes and jumped in completely naked!! Just as he was about to proudly show everyone the incident he had just experienced, Kirill was squatting in front of him. As punishment for breaking his promise, Ryuki was ordered to take charge of the camera, and he and his friend who was there started filming a video. Seeing this, Ryuki was filled with jealousy, regret, and frustration, and he let out all his feelings on Kirill! To give him summer memories, virgin hunter Kirill has arrived!! He’ll squeeze out every last drop with a 5P blue ◯.