Natsuyume Nagisa

Nagisa is a boy who has lost his past memories. He lives on a reclaimed island covered in sunflowers, where beautiful butterflies flutter and stray penguins wander. One summer day, he encounters several girls, and through his interactions with them, he begins to search for the fragments of his forgotten past.

As Nagisa spends time with the girls, he gradually uncovers glimpses of a significant person buried deep within his memory. The summer of presence, the summer of absence, the summer shared with someone—each encounter brings him closer to understanding his true self. But what kind of memory will he ultimately reach?