Book (Practical) Children's book The Sea Color Diary : Quintuplet idol's Secret Birthday? Shueisha Mirai Bunko

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Children's Book
Shueisha Mirai Bunko / Junior High School 1 結亜 no Ie is a boarding house by the sea. What a new lodger is my dream idol Unit (Tachibana brothers)! Moreover, I thought they were twins, but they were quintuplets! The quintuplets are cool as they are in idol, and they all have different Character. It's like a dream that Quintuplets idol lives in the house next to us! Moreover, I transferred to the same junior high school, so every day in 結亜 is so exciting? Is this love? Quintuplets don't have parents. That's why they make money from models and idol. Although it is supposed to be the birthday of Quintuplets soon, the second son Futaba hides it for some reason? But 結亜 who wants to celebrate has decided to be a model in order to buy a birthday present? Super popular! The 3rd Heart-Chest Story by the Sea!