13 parts Complete Reve's summer vacation takes an unexpected turn when his childhood friend Arya invites him on an adventure inspired by a mysterious old notebook. The notebook leads them to uncover a series of whimsical mysteries scattered around their small district, each more curious than the last. As they delve into the enigmas, the two friends rekindle the joy and connection of their shared past, discovering that even the simplest adventures can hold profound meaning. Yet, as their journey nears its end, Reve begins to sense an unspoken truth beneath Arya's cheerful resolve-one that will reveal itself when the final mystery is solved.