One night while Kei Kusanagi is resting by a lake he sees a UFO crash into it. He jumps to his feet and suddenly sees a glowing woman appear on the lake. He runs away screaming but his world abruptly goes blank and he enters a "standstill". The next day at school, the class has a new teacher named Mizuho Kazami who turns out to be the strange woman from the previous night! Was it all a dream? And what will happen when Mizuho is Kei's new neighbor?

Kei and Mizuho go to the beach and stay at a hotel for their honeymoon. Unfortunately, things go wrong when they see Kei's friends turn up to stay at the same hotel. Two of Kei's friends begin to take steps beyond friendship.

A year has passed since Mizuho left Earth. Everythings change and have fogotten about her thanks to Mizuho's planet. But thanks to her mother and her sister's help, she returns to Earth and this time, she's staying at Earth for good. As she becomes a teacher once more, she introduce herself which is similiar to Episode 1.

She moves in at the same neighbourhood with Kei and even helps her carry the stuffs. But the differenece is that they switch sides and Mizuho tripped and fell onto Kei. She cried while not facing him and intend to tell him everything but to her surprised, she was shocked that he ask whether she's doing another planetary research.

When he manages to answer her first date (in episode 5), he manage to answer it. He tells him that he's been holding her Pochy box even since she left and after seeing her, he remebers it. She cried while Kei intend to be with her forever. The finale ends by each others kiss while her sister and her mom were happy to see it. Now they are tog