IQ探偵ムー (Series) favorite_border

[DeepL Translation - needs review] Volume 1 Introduction: One day during a spring storm.　With a gust of wind, a girl transfers to the class of fifth graders Moto and Ruka.　Her name was Yumeha.　She was an exceptionally beautiful girl.　However, she was blunt and dozed off in class.　And yet, she easily solves mysteries that no one else can understand.　With the appearance of the enigmatic Yumeha, every day of Gen and Ruka's life changes into something mysterious.　Who in the world is Yumeha?

(Translator: DeepL)