The single-season narrative follows a wounded newcomer through island adventures, lighthouse memories, supernatural mysteries, ritual preparations, and the final recovery of hidden identity.
Story Structure — 5 Plot Phases
Island Arrival
The opening establishes a wounded boy beginning a new life on a quiet island. Everyday adjustment gradually gives way to curiosity about a mysterious chest.
Key Events
Arrival on the Island — A young boy with a wounded heart begins a new life on a quiet island.
Location: Torishirojima Island
Settling into Summer — The boy with the broken wings gradually settles into island life during summer vacation.
Location: Torishirojima Island
Chest in the Attic — A mysterious chest is uncovered in the attic of a school.
Location: School attic
Treasure and Higenekos
The chest inspires a search for keys and a pirate ship. The adventure expands into the history of the Higenekos.
Key Events
Search for Treasure Keys — A group searches across the island for keys connected to the treasure chest.
Location: The island
The Higeneko Story — The search for a pirate ship leads to the story of the Higenekos.
Location: The island
Girl at the Lighthouse — A girl sitting on a lighthouse is trying to discover what she wants to do.
Location: Lighthouse
The Lighthouse Summer
A lighthouse girl struggles to find a purpose, then commits to building a balcony from collected cans. A search across the island leads to a memorable summer break.
Key Events
A Lighthouse Balcony — The girl decides to build a balcony on the lighthouse using empty cans she has collected.
Location: Lighthouse
A Lost Search — A search for the lighthouse girl ends with the searcher becoming lost himself.
Location: The island
An Unforgettable Break — The boy gives the lighthouse girl a summer break she will never forget.
Location: The island
Butterflies and Night
A new girl and a butterfly search introduce a more enigmatic layer of the island story. A forbidden nighttime mountain visit reveals that the warning was justified.
Key Events
The Night Girl — After starting over on the island, the boy meets a new girl associated with the summer butterfly and the night.
Location: The island
Warning in the Mountain — The boy ignores a warning not to return to the mountain at night, and the warning proves justified.
Location: Mountain
Butterfly Reunion — The search for a butterfly continues, followed by a reunion and an exchange of memories.
Location: The island
Ritual and Vanishing Summer
Preparations for the Natsudori ritual proceed as visions become clearer. Summer fades, memories are lost, and a final identity revelation brings the summer stories to an end.
Key Events
The Ritual Preparations — Arrangements are made for the Natsudori ritual while visions become clearer.
Location: The island
Summer Begins to Fade — As summer draws to a close, the boy begins to forget, and time moves on after the season ends.
Location: The shore
The Memory Revelation — A girl wakes on the island without memories, her true identity is revealed, and the story of a summer wish reaches its end.
Location: The island
Story Breakdown
Island Arrival — The story begins with a wounded boy entering a quiet island community and adjusting to a new summer.
Wounded Beginning — A young boy starts a new life on the island.
Summer Adjustment — The boy gradually settles into island life.
Chest Adventure — A school attic discovery develops into a treasure hunt involving keys, a pirate ship, and the Higenekos.
Attic Discovery — A mysterious chest is found in a school attic.
Higeneko History — The search for the pirate ship reveals the story of the Higenekos.
Lighthouse Summer — The lighthouse storyline explores uncertainty, creativity, and the value of a personally meaningful summer break.
Finding Purpose — A girl at the lighthouse tries to discover what she wants to do.
Balcony Project — Collected empty cans become the material for a lighthouse balcony.
Unforgettable Break — A summer experience is created for the lighthouse girl.
Butterfly Mystery — A later encounter introduces a butterfly-centered mystery and connects island memories with a dangerous nighttime mountain visit.
Night Girl — A new girl appears as the summer story enters a more mysterious phase.
Mountain Warning — A warning about returning to the mountain at night proves justified.
Butterfly Search — The search for a butterfly continues through a memory-focused storyline.
Natsudori Ritual — The approaching ritual organizes the final stretch of the season while visions and preparations intensify.
Ritual Preparations — Arrangements and lantern-making prepare the island for the ritual.
Clearer Visions — Visions become clearer as the ritual draws near.
Memory and Closure — The final episodes examine forgotten identity, the passage of time, and the fulfillment of a summer wish.
Fading Summer — As summer ends, forgetting begins and time moves forward.
Future Memories — A girl wakes without memories before her true identity is revealed.
Pocketful of Closure — The final summer story reaches its conclusion.
Hairi Takahara never expected summer to feel like a dream. Sent to Torishirojima to sort through his late grandmother's belongings, he's met with endless sea, quiet nostalgia, and mysterious girls, each chasing something just out of reach. As he settles into island life, lost memories begin to surface and he finds what he never knew he'd lost.
