Naoki Kuzumi, a junior in high school, had lost his parents in an accident five years ago, and is living with his aunt, uncle, and cousin Matsuri. He always thought his life was ordinary, besides the fact that he can't remember what happened in his youth. One sunny day as he is taking a nap on a bench, a redheaded girl -- Mikoto -- literally falls on him from the sky. For some reason, she thinks he's her younger brother. Naoki's time period is a temporal shelter for those in the future, when many are suffering from an incurable disease. When she heard her younger brother Yuusuke had been taken to Naoki's time, Mikoto herself had gone back in time. (Source: ANN)

Fuguno Matsuo has never had a girlfriend all his 24 years in life and what makes things worse is that a fortune teller predicted that he never will. However, when he laid his eye on Nagisa-sensei he fell in-love right away and began earnestly wooing her. Along comes Hamaoka, a co-worker who is smitten with Fuguno, and a love-triangle ensues.

When college student Tsuyoshi returns to his apartment from a convenience store, he is surprised to see Yui Kooriyama at his doorstep. Sent by his mother to check up on him, Yui forces herself inside his personal living space. Despite Yui already being married, the seemingly normal visit takes a sudden turn when they get drunk and spend a night together. As he is invited for more drinks by other married women, Tsuyoshi finds himself sharing all kinds of intimate moments with them.

Tasuke Shichiri is the envy of his friends because since his parents are always traveling he can do as he pleases. It's a surprise present from his father that keeps him from being lonely: an odd ring known as the shitenrin. From it comes a moon goddess named Shaorin, dedicated to protecting her master -- no matter how much of a mess she makes doing it!