A Couple of Cuckoos Vol. 11

Product Name: The Locked Room Mystery Description: Get ready for a thrilling adventure filled with twists and turns! In this gripping tale, 16-year-old Nagi Umino finds himself in the middle of a mysterious locked room situation.

Accidentally switching places with his birth parents' daughter, he must navigate through a complex web of family secrets and unexpected alliances to uncover the truth.

But that's not all - a brash and outspoken girl named Erika Amano is determined to make Nagi her fake boyfriend, leading to a series of hilarious misunderstandings and romantic entanglements.

Will Nagi be able to solve the mystery before it's too late? Find out in this page-turning novel that will keep you guessing until the very end!