12 episodesFirst aired 8 July 2025
A lot has happened for Nagi Umino and Erika Amano: they were swapped at birth, learned of their engagement, and have started living under the same roof. The two now share their home with Nagi's sister, Sachi, and his crush, Hiro Segawa. Despite this unusual domestic situation and frequent quarreling, the group is beginning to settle into a life together. However, the return of Nagi's childhood friend Ai Mochizuki to Japan complicates things. Ai suddenly declares her intention to marry Nagi, and although he turns her down, she is committed to having him all to herself. Now with four girls around, each with their own thoughts about him, Nagi must figure out his own feelings and the best way forward.
E1Jul 202524m
Hiro moves in with Nagi, Sachi and Erika. Friction arises, but they're reminded of what happiness might mean.
E2Jul 202524m
Hiro is kidnapped and Nagi immediately sets out to save her.
E3Jul 202524m
Nagi is suddenly hit with the truth about Ai’s real objective.
E4Jul 202524m
Hiro is preparing for a festival that's about to be held at her shrine.
E5Aug 202524m
The world now knows the face of singer Mochizuki Ai, who created the song “Arc Fault.”
E6Aug 202524m
Nagi and Erika are trapped in a hotel room by her mother, who seems to be playing with them.
E7Aug 202524m
E8Aug 202524m
E9Sept 202524m
E10Sept 202524m
E11Sept 202524m
E12Sept 202524m