A Couple of Cuckoos

Umino Nagi was swapped with another child at birth; he's going to meet his real parents today; 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; Nagi can't wrap his head around how loaded Erika is.

Living together with Erika gives Nagi an opportunity to focus on exam prep.

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

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

Erika is Nagi's wingman during Nagi and Hiro's morning study session.