Top Seek Let 1 (Kadokawa Tsubasa Bunko)

[Machine Translation] The elementary school that I, Nano, attend is not normal. It is a "spy academy. It is a school in a secret location, where selected students from all over the world gather to study. One day, the school's hidden treasure is stolen! In addition, everyone is drugged and only two students can move. Leo, a genius (but with a terrible personality) and his childhood friend, suddenly find themselves on a top-secret mission to retrieve the treasure... The two of them are a perfect match, and must fulfill a mission that is too dangerous! Winner of the 9th Kadokawa Tsubasa Bunko Novel Award "Gold Prize"! From elementary school intermediate level.

あたし・ナノが通う小学校は、ふつうじゃない。そこは―“スパイ学園”。ヒミツの場所にあって、世界中から選ばれた生徒が集まるトクベツな学校。ある日、そんな学園の秘宝がうばわれた!おまけにみんなが薬で眠らされ、動けるのは二人だけ。天才(だけど性格はサイテー)な幼なじみのレオといきなり、宝をとり返すため「正体がバレたら終わり」な極秘任務にいどむことになって...。相性サイアクな二人で、キケンすぎる使命を果たせ!第9回角川つばさ文庫小説賞“金賞”受賞作!小学中級から。