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.

Nagi and Erika are now engaged, but Nagi can’t wrap his head around how loaded Erika is, and Erika seems to have concerns of her own.

Living together with Erika gives Nagi an opportunity to focus on exam prep, except when they run into trouble.

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

Hiro and Nagi begin studying together in the mornings, but unexpected circumstances put a wrench in their relationship.

Erika joins Nagi’s and Hiro’s morning study sessions to wingman for Nagi, and Hiro wants to come hang out at her place.

Nagi invites Hiro to join his group for a school field trip. The group is plunged into chaos with the addition of a couple more members.

Sachi notices something going on between Erika and Nagi and decides to try to get to the bottom of it. Both she and Nagi are on the verge of a big decision.

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

Sachi and Nagi go shopping together for a Mother’s Day gift, but they can’t think of anything their mother would appreciate

Erika and Nagi are stuck in a power outage. Nagi goes to the front door to find an emergency kit, when the unthinkable happens.

Nagi tries to redeem himself after embarrassing himself in front of Hiro on their amusement park date.