Spring time in April and the last of the cherry blossoms are still in bloom. The usually aloof bookworm with no interest in others comes across a book in a hospital waiting room. Handwritten on the cover are the words: “Living with Dying.” He soon discovers that it is a diary kept by his very popular and genuinely cheerful classmate, Sakura Yamauchi, who reveals to him that she is secretly suffering from a pancreatic illness and only has a limited time left. It is at this moment that she gains just one more person to share her secret. Trying to maintain a normal life as much as possible, Sakura is determined to live her life to the fullest until the very last day. As her free spirit and unpredictable actions throw him for a loop, his heart begins to gradually change.

After winning the fierce Inter High race, Sakamichi and the other Sōhoku team members receive an invitation to compete in the Kumamoto Hi Province Mountain Range Race towards the end of summer. The top-tier teams from around the country compete in this race, including Sōhoku’s rivals Hakone Academy (which yearns to take down Sōhoku), Kyoto Fushimi, and Hiroshima Kureminami – as well as Kumamoto Daiichi High School’s team led by Shin Yoshimoto.

Ren Homura returns to his former residence, yet he feels very uncomfortable: he possesses no memory of having lived there. Without warning or his permission, a game called “Monster Strike” installs itself into Ren’s smartphone; monsters of the game then literally fly out from his smartphone and start fighting on streets. Watching the fighting in amazement, Ren starts picking up his lost memories.

Monster Strike: The Movie serves as a prequel to the net anime series based on the game of the same name. The anime tells the story of Ren, who returns to his hometown with no memories of having lived there. When a a cell phone repairman installs the Monster Strike app on his phone, Ren finds himself pulled into a real-world version of the game and begins piecing his memories together again.