Makoto is transferred to the office next door to the company where Haruko works. One day, a mysterious man tells Makoto that Haruko is Makoto's soul mate.

The mysterious man advises Makoto that he needs money to beat Sadaoka and win over Haruko. Working hard to acquire a new customer, Makoto is surprised to learn who this new customer is.

After dinner with Haruko and Sadaoka, Makoto goes home feeling defeated by Sadaoka. The mysterious man advises Makoto to memorize 100 classical pieces and their authors in order to beat Sadaoka.

Makoto finds out that Haruko has worries about her love life. What is the advice from the mysterious man this time? Makoto has to get his carrot-hating department head to eat carrots.

While having dinner together, Haruko's favorite sumo wrestler visits the restaurant, and Makoto and Haruko decide to attend the sumo wrestler's haircutting ceremony. Little do they know that this will turn out to be a miraculous first date.

In order to show Haruko how macho he is, Makoto is advised to speak with her like a bossy husband. However, his demeanor makes her worried that he might be angry with her.

Makoto's next mission is to get Haruko a ring for her birthday. Since Sadaoka can tell the size of a ring just by looking at the finger, Makoto decides to train with Sadaoka to determine the size.

Makoto begins to get along with Haruko's father, Daichi. However, shortly thereafter, Daichi accidentally learns that Makoto's ex-girlfriend is a criminal, and now opposes the relationship with Haruko.

Makoto and Haruko decide to go on a trip together. The mysterious man finally reveals his true identity to Makoto and gives him a ridiculous challenge as the final test.

The mysterious man disappears, and Makoto loses the memory of the man as well. Because of the disappearance of the man, Makoto and Haruko's fate as a couple is no longer secure.