With a crush on Natsuki Shinohara and a talent for math, high school student Kenji Koiso lands a part-time job maintaining the virtual reality world of OZ. Just before summer break, Natsuki asks him to join her for her great-grandmother's 90th birthday celebration in the Japanese countryside. Despite struggling to fit in with her lively family, Kenji receives an enigmatic email featuring a complex code and the directive to "solve me." Unbeknownst to Kenji, cracking the code could have major consequences.
