A Song to the Sun

Life in Darkness

Kaoru lives with a rare and devastating medical condition called Xeroderma Pigmentosum, which makes direct exposure to sunlight potentially fatal. Her skin cannot repair damage caused by ultraviolet radiation, meaning even brief contact with sunlight causes severe burns and can lead to cancer and death. This condition has fundamentally shaped her existence—she sleeps throughout the day when most people are active, and only emerges at night when darkness makes the world safe for her.

Despite these severe limitations, Kaoru has found a way to express herself and connect with the world. Every night, she busks in front of a train station, playing guitar and singing for passersby. Music provides her with purpose and joy, allowing her to share something beautiful with people even though her condition isolates her from normal social life.

From her bedroom window, Kaoru has been secretly observing a high school boy who passes by each morning carrying a surfboard. She watches him meet his friends and head to the ocean before the day fully begins. This routine viewing has developed into something more—she has developed feelings for this boy despite never having spoken to him, knowing him only through distant observation.

First Encounter

One day, Kaoru gathers courage and introduces herself to the boy without revealing her medical condition. He identifies himself as Kōji Fujishiro. Their conversation is cut short when Kaoru's friend arrives and drags her away, concerned about the approaching sunrise. Later, sitting safely by her bedroom window, Kaoru watches Kōji meet his friends and explains everything to her companion. Her friend realizes that Kaoru likely attends the same school as Kōji, though she can only attend at night. The friend offers to observe Kōji during daylight hours and report back, becoming Kaoru's daytime spy.

The following evening, Kaoru positions herself at a bus stop, hoping to encounter Kōji again. He arrives on his scooter, and both feel embarrassed by the deliberate nature of this meeting. They begin talking, overcoming their initial awkwardness. Kōji promises to meet Kaoru again and listen to her perform at the start of the school holidays, giving them both something to anticipate.

Growing Connection

When they meet for Kaoru's performance, they discover another street performer has claimed her usual spot. The obnoxious musician refuses to yield, forcing them to adapt their plans. Kōji decides to take Kaoru into the city instead, showing her sights she has likely never experienced during her nocturnal existence.

After exploring various locations, Kaoru begins playing her guitar in a public square. Her talent and genuine emotion attract a substantial crowd. Strangers gather to listen to her sing, drawn by the quality of her performance and perhaps sensing something special about this young woman performing under the stars. The experience is transformative for Kaoru, who typically plays for scattered passersby at the train station.

After her impromptu concert, Kōji takes Kaoru to watch the ocean. The beach at night offers beauty without danger, allowing Kaoru to experience a place she can never visit during daylight hours. During this peaceful moment, Kōji asks Kaoru to officially date him. She accepts, beginning a romantic relationship despite the complications her condition will inevitably create.

Dawn and Truth

Their date must end abruptly as the sun begins rising. Kaoru rushes home, unable to explain her sudden departure without revealing her condition. Kōji soon learns the truth about Kaoru's Xeroderma Pigmentosum from other sources. The revelation takes him aback—understanding that his girlfriend can never experience daylight, that their relationship will be confined to darkness, and that her condition is progressive and ultimately fatal.

Kaoru, sensing Kōji's shock and perhaps fearing rejection or pity, stubbornly refuses to see him for a period. She withdraws into self-protection, preferring isolation to witnessing Kōji's potential inability to accept her reality.

However, Kōji demonstrates his commitment through action rather than words. He learns about a professional recording studio where Kaoru could record a debut single, creating a permanent record of her musical talent. The studio time is expensive, far beyond what a high school student typically possesses. Kōji takes multiple small jobs, working during hours when Kaoru sleeps, earning money slowly but steadily to pay for studio time.

Kaoru's father, observing the situation and concerned about his daughter's emotional state, invites Kōji to their home one evening. During dinner, Kōji reveals his plan to fund Kaoru's CD recording. As they walk together after dinner, Kōji and Kaoru talk more openly. Through this conversation, Kaoru slowly realizes the depth of Kōji's feelings and his genuine commitment to her despite the challenges her condition presents.

Deterioration

Kaoru's medical condition begins worsening progressively. She loses sensation in her hands—a devastating development for a guitarist. The nerve damage robs her of the ability to play her instrument, eliminating one of her primary forms of self-expression and connection to the world. Despite this loss, Kaoru tries to remain optimistic, assuring Kōji that she still possesses her voice. She can continue singing even if she can no longer accompany herself on guitar.

When the time arrives to record in the studio Kōji has paid for, Kaoru makes an unusual request. She asks her family and friends to leave the studio, wanting to record privately. She promises they will hear the results when the CD is completed. This request suggests Kaoru wants her final musical statement recorded without the emotional weight of her loved ones watching her perform while knowing her time is limited.

The Beach

Some time after the recording session, Kōji fulfills a promise he made to Kaoru—he brings her to the beach to watch him surf. For years, Kaoru has owned a protective suit designed to shield her from sunlight, allowing brief exposure to daylight if fully covered. The suit has hung unused, representing possibilities never pursued. Finally, she wears it to the beach.

By this point in her condition's progression, Kaoru requires a wheelchair for mobility. As she sits on the beach in her protective suit, she complains that the suit is getting hot. The heat is uncomfortable, but removing the suit would expose her to direct sunlight and cause immediate damage.

Kaoru's father, his face showing pain that he quickly suppresses, suggests that if the suit bothers her, she could remove it and run freely without its constraints. His suggestion carries heartbreaking subtext—he is offering her the choice to experience true freedom one final time, even knowing the consequences. Kaoru declines this implicit offer.

Despite her wheelchair and physical weakness, Kaoru struggles to stand. She limps weakly toward Kōji across the sand. As she walks, she trips and appears to fall. Kōji rushes toward her, concerned and ready to catch her. At the last moment, Kaoru catches herself, revealing the stumble was a deliberate feint. She giggles at Kōji's surprised expression, demonstrating that even in her deteriorated state, she retains her playful spirit and ability to find joy.

Final Song

Eventually, Kaoru succumbs to her medical condition and dies. Her family lays her to rest in a coffin filled with sunflowers—bright, sun-loving flowers that Kaoru could never safely be near during her life, now surrounding her in death.

Kōji, Kaoru's friends, and her family gather to listen as Kaoru's CD is finally released and played. The recording she made in private becomes her legacy, allowing her voice to persist beyond her death. Her music continues existing in the world even though she cannot.

The final scene shows Kōji at the ocean, rushing toward the waves with his surfboard. As he moves, his mind replays Kaoru's voice—her songs, her words, her presence preserved through memory and recording. The ocean that he loves and that Kaoru could only safely visit in darkness continues, as does his life, carrying forward the impact she made during their brief time together.