この中に1人、俺の嫁がいる (Series) favorite_border

[DeepL Translation - needs review] Volume 1 Introduction: In order to get clues about his twin brother who suddenly disappeared, the main character is replaced and goes undercover at the school. However, what is revealed there is a shocking fact!　His brother had multiple fiancées and ......? (Author: Kudu / First published in GANMA!)

(Translator: DeepL)