"Aika" grew up without any inconvenience in her wealthy parents. At the advice of her parents, she married a man older than her and led a normal life. One day, she learns about "papa activities" from a classmate at ● school and meets a man who contacted her out of a slight interest in her. Even as she felt guilty, she was uplifted by a throbbing sense of incongruity. When she met the man again, the gentle man tied Aika up with a rope. At first, she wanted a little stimulation out of her curiosity, but at some point she became addicted to being sucked in.
