A year ago, Saeko remarried a man with a child and became the mother of a university student, Gaku. One day, she said, "Mom, I decided to join the event circle." I was there, but... And a few days later, Manabu comes to her house with friends from the circle. All the members who are doing some evil schemes for the summer event. Then, they come up with the idea of having Saeko drink the "original drink" they invented...
