Echo/Zeon  

Echo Zeon, エコー/ゼオン

In 1999, we follow the journey of three friends during their high school years. Yukari is a driven individual who values money and has great ambitions. Takao is a kind-hearted person with a shy nature, yet he excels in karate. Kanze possesses an extraordinary talent: she can perfectly replicate any sound she hears, be it someone's voice or a musical instrument. The trio spends their days solving mysteries and taking on cases assigned by other students. Their high school experience is filled with excitement as they tackle various challenges such as kidnappings and myth-busting.