Kakkou no Iinazuke (A Couple of Cuckoos) 17 (Weekly Shonen Magazine KC)

[Machine Translation] Nagi's own brother, Sosuke, is in the dark. He visits Sachi and tells her of his shocking purpose! While the search for Sosuke is in full swing, Erika is approached by a mysterious "S" account! Nagi Unno, a sophomore in high school who was mistaken for her brother when she was a baby, now attends a prestigious private school. One day, she runs into Erika Amano, a very young high school girl who is on her way to meet her daughter-in-law, and half-heartedly asks her to pretend to be her boyfriend. However, they had no way of knowing this at the time. Erika is a child who was mistaken for Nagi, and Nagi is Erika's ex-wife. ...... This is the start of a romantic comedy of intertwined lives that begins with "The Misplaced Child"! Nagi's own brother, Sosuke, plays a dark role! He visits Sachi and tells her his shocking purpose--! Nagi and Hiro are staying at Amami House. Their relationship develops further under one roof! The "search for Sosuke" is in full swing! Ai, the goddess of salvation, appears to help Nagi, who is struggling greatly! The episode of their first encounter is also revealed.... The episode of their meeting is revealed... And Erika is approached by the mysterious account "S"! In the midst of the tension, fate takes an unexpected turn!

凪の実兄・宗助、暗躍。幸の元を訪れ、衝撃の目的を語る！　宗助捜しが本格化するなか、エリカに謎のアカウント「S」が迫る！赤ちゃんの頃に取り違えられ、今は名門私立に通う高校 2年の海野凪。ある日、これから許嫁に会いにいくという超お嬢様女子高生・天野エリカと偶然出会い、彼氏のフリをしてくれと半ば強引に頼まれてしまう。だが、その時の二人は知る由もなかった。エリカは凪と取り違えられた子どもで、凪はエリカの許嫁相手だということを……。「取り違え子」から始まる人生交錯ラブコメ開幕！凪の実兄・宗助、暗躍！！　幸の元を訪れ、衝撃の目的を語る――！！　凪とひろは天海ハウスでお泊まり。一つ屋根の下、二人の関係がさらに進展！　“宗助捜し”は本格化！ 大苦戦する凪のもとに、救いの女神・あいちゃん登場！！　二人の出会いのエピソードも明らかに…。そしてエリカに、謎のアカウント「S」が迫る！　緊迫の中、運命は予想外の方向へ！！