Itsuka Aeru Kimi ni

At Okagi Castle, the bond between Yuuki and his childhood friend An is put to the test when he reveals his family's impending move. In a moment of vulnerability, Yuuki expresses his desire to be together again in the future, leaving An torn between hope and uncertainty. In a flurry of emotion, she flees and unexpectedly stumbles upon a mysterious portal at the castle's entrance, which transports her 50 years into the future.

In this unfamiliar time, An encounters Kibou, a kind-hearted boy accompanied by his quirky robotic companion, Butler-kun. Tasked by his grandmother to assist any distressed girls he meets, Kibou eagerly steps in to guide An through the transformed city. As they navigate the streets of Okagi, An discovers that while the landscape has evolved, the essence of the town—filled with cherished memories—remains intact, prompting her to reflect on the enduring nature of their connection.