Children's book A DOUBLE DATE AT A FIREWORKS FESTIVAL? Shueisha Mirai Bunko

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Utaha and Shiori from Children's Book
Shueisha Mirai Bunko / Chu-1, Utaha and Shiori are identical twin sisters. Their personalities are the opposite, but they have been Nakayoshi ever since I was a child! One day I happened to know that 智希, who fell in love with Shiori at first sight, and Rei, who is concerned about 歌羽, are also twin brothers? There is a little bit more to the fireworks display that 歌羽 and Shiori have been looking forward to. My older sister Utaha was in poor health when I was a child, so they were not allowed to go to the fireworks display without their parents until now. But this year we can go with only friends! Maybe we can meet that person who I am interested in? Anyway, they were happy, but there was a trouble with Utaha because of study and club activities? It should be a fun summer, but 歌羽 and Shiori Festival!