Kibō lives in Ogaki City approximately 50 years after An's time. He meets An when she unexpectedly arrives through a time portal, accompanied by his robot companion, Butler-kun. Kibō helps her initially because his grandmother left specific instructions to assist troubled girls in the park, revealing his helpful and proactive nature.

He acts as An's guide through the transformed, futuristic Ogaki City. During their exploration, he helps her understand this new environment, pointing out how technological progress coexists with preserved historical elements. This tour demonstrates his knowledge of the city and its evolution.

Kibō later clarifies a significant aspect of his background: his grandmother is An herself, and his grandfather is Yuuki, An's childhood friend who confessed his feelings just before her time displacement. This makes Kibō a direct descendant of these two central figures from the original timeline.

His role extends beyond practical guidance; he provides emotional reassurance to An concerning her anxieties about the future and the stability of relationships over time, especially her bond with Yuuki. His presence and statements comfort her, suggesting her fears about changing feelings are unfounded and that her future holds positive outcomes. His existence inherently symbolizes the potential longevity and fulfillment of An and Yuuki's relationship.

Butler-kun consistently works alongside Kibō, aiding An during her time in the future, demonstrating Kibō's cooperative nature and access to supportive technology.

Kibō does not appear in the sequels "Ogaki Matsuri ni Ikou yo!" or "Gakitabi!: Seishun Oshiro-hen." His narrative involvement is confined solely to the original ONA episode.