16-year-old super-studier Nagi Umino, second-year student at the Megurogawa Academy high school, was switched at birth. On his way to a dinner to meet his birth parents, he accidentally meets the brash, outspoken, Erika Amano, who is determined to make Nagi her fake boyfriend as she never wants to actually marry. But once Nagi makes it to dinner, he finds his parents have decided to resolve the hospital switch by conveniently having him marry the daughter his birth parents raised...who turns out to be none other than Erika herself!
E1: You're going to be my boyfriend.▶ PLAY
E2: I'm not going to marry you.▶ PLAY
E3: You aren't going to beat me!!!!▶ PLAY
E4: Would you please go out with me...?▶ PLAY
E5: Can we do our morning study sessions together...?▶ PLAY
E6: I thought you live by yourself.▶ PLAY
E7: Is my fate going to change?▶ PLAY
E8: Are you going to marry him?▶ PLAY
E9: The Kuroshio currents beckon to me.▶ PLAY
E10: Don't treat me like your kid sister.▶ PLAY
E11: I can't forget that just happened.▶ PLAY
E12: It's not that I like you, yet.▶ PLAY
E13: Things aren't quite working out, are they?▶ PLAY
E14: Walls exist to be overcome!!▶ PLAY
E15: We have to tell her... about our secret!▶ PLAY
E16: I want to talk about now.▶ PLAY
E17: Anything could happen right now!▶ PLAY
E18: Who is that person?▶ PLAY
E19: You must have noticed by now.▶ PLAY
E20: I want to grow up already!▶ PLAY
E21: It's a secret between you and me.▶ PLAY
E22: I'll Be There With You▶ PLAY
E23: What Should We Do Now?▶ PLAY
E24: All That Matters Is That You Two Are Happy▶ PLAY
E1: Who Was Umino-kun's First Love?▶ PLAY
E2: Onii Confessed to You, Didn't He?▶ PLAY
E3: That, but Times a Hundred▶ PLAY
E4: I See You're All Together▶ PLAY
E5: It's My Life, Too!▶ PLAY
E6: There's No Way I Can Be Normal!!▶ PLAY
E7: It's Ours to Build!▶ PLAY
E8: No Such Thing as a Meaningless Kiss▶ PLAY
E9: The Real Enemy is Sachi-chan!!▶ PLAY
E10: Episode 10▶ PLAY
E11: Episode 11▶ PLAY
E12: Episode 12▶ PLAY