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Kenji, a shy high‑school math prodigy, spends his vacation at his crush Natsuki’s sprawling ancestral home in Nagano. He’s roped into a playful ruse—pretending to be her fiancé for a lively family birthday celebration—while navigating the eccentric, multigenerational Jinnouchi clan and their warm, chaotic gatherings.
When a cryptic equation pops up on his phone, Kenji’s talent draws him into a digital crisis: the nation‑wide AI network OZ has been compromised. With the clan’s unconventional support, he must outwit the hacker and protect the world’s infrastructure, blending heartfelt family moments with high‑stakes cyber‑action.
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