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A twist of fate leads Taro, Reiya and Kazuhiko, three capable men with happy single lives in the city, to reconsider pursuing marriage.

Taro reunites with his ex-girlfriend Mai who even thinks about getting married. His feelings were rekindled and even proposed on the phone! Taro feels good about Mai's answer when he wants to meet and talk in person. However, his buddies Iwakura and Miyoshi strongly oppose it.

At a hot spring inn, Miyoshi noticed that Iwakura was fond of Toko as he was. Meanwhile, Kazuna suddenly kisses Taro who is trying to forget about his feelings for his ex, Mai!

Taro confessed that he is interested in dating Kazuna, but was confused by the condition of "on the premise of marriage" and put the answer on hold. After a discussion with Miyoshi and Iwakura, the three AK boys decides to go on a night out to broaden Taro's views and then decides on the marriage...

Taro finally decided to connect with Kazuna but in a twist of fate – his former love, Mai who should have traveled abroad appeared in front of him ! She returned to Japan because of the unfamiliar newlywed life abroad and the fight that occurred there ...

Taro was taken aback by Kazuna who said, "I want Taro-chan only for myself". Mai who has nowhere to go, stays in the room. Mai also confessed that she doesn't like her friends.

Miyoshi who solved the last remaining "grave problem" with his ex-wife, has recovered both physically and mentally, thus expectations for a new love have increased. Iwakura also started living together with Toko at the same time! Meanwhile, Kazuna has a lover ...

Taro, Miyoshi, and Iwakura have faced various challenges unique to singles. Taro's job change, Miyoshi's aesthetic dental clinic's poor management, Iwakura's living with him. Talking about their worries ...