Operation Love

Ken Iwase (岩瀬健) is at his friend, Rei Yoshida's (吉田礼) marriage ceremony. However, he still loves her and regrets not having confessed his feelings towards her. A fairy lets him travel back in time and try one more time to get Rei's heart.

In each episode, Ken travels to each photo that will appear in the slideshow that Mikio made, so that he can correct his regrets in each photo.

A year later, the characters are in Hawaii for Hisashi's and Eri's wedding ceremony. The fairy appears and allows Ken to travel back in time to save the couple's relationship.

Ken Iwase (岩瀬 健, Iwase Ken)

The lead protagonist of this drama. Ken's biggest regret is never being able to confess his feelings to his Rei. Rei calls him Ken-Zou as a term of endearment. He was on the baseball team in high school and is currently a salesperson for electronic whiteboards. During Rei's wedding, he is given the chance to relive key moments of his life by entering into different photos in one of the presentations. He is extremely kind-hearted, even helping Tetsuya Tada knowing that in the future, Tada will be his main rival for Rei's affection.

Rei Yoshida (吉田 礼, Yoshida Rei)

Rei has been a childhood friend of Ken's. Their initial meeting is when Ken breaks his eraser in half and shares it with Rei. She has secretly loved Ken as well, but has never been able to articulate her feelings for him. Her seat in high school was always next to Ken's. In university, she studied architecture and won a major architectural award during the course of her studies. At the end of the series, she realizes that she never took the risk of telling Ken her feelings and runs out of her wedding to chase after him.

Eri Oku (奥 エリ, Oku Eri)

Eri has always been the person of Hisashi's affection. She finally decides to go out with him after he stops her from returning to an ex-boyfriend. She is also the best friend of Rei since high school.

Enokido Mikio (榎戸 幹雄, Mikio Enokido)

Mikio begins to figure out that Ken is "slipping through time" and decides to assist him in his quest to change the future. He is also Ken's best friend because he is the only one who knows Ken's feelings towards Rei.

Hisashi Tsurumi (鶴見 尚, Tsurumi Hisashi)

One of Ken's friends. He has always had a crush on Eri even after initial rejections.

Tetsuya Tada (多田 哲也, Tada Tetsuya)

Originally a student teacher at Ken's high school, Tada becomes friends with Ken's group and eventually marries Rei, but after the fairy miracle from which Ken's and Rei's relationship is born, he is seen teaching at a university and is on good terms with his childhood friend.