Umino Nagi was swapped with another child at birth. He’s going to meet his real parents today, but on his way to school, he meets a girl who is threatening to die to get out of her engagement.

Having scored higher than anyone else in his grade, including Hiro, Nagi decides to finally confess to her.

Hiro and Nagi go on date at the amusement park. Sachi is not amused.

Erika’s parents want her to come home if she fails her make-up exams. She asks Nagi for help, but it may not be that easy.

Nagi is hoping to do the test of courage with Hiro, but Erika takes him instead. Nagi can’t figure out what it is that’s bothering her.

Having topped his grade in the term exams, Nagi confesses to Hiro once again.

The household visits the diner to attend Yohei's birthday party and learn some family secrets surrounding them. The next day after a study session, Erika succumbs to a cold that she caught, and the household, including Hiro, scrambles to help her through it.