Rainbow Days (2018) Characters, Setting & Themes Explained

Natsuki Hashiba is the earnest, pure-hearted protagonist of Rainbow Days, whose crush on Anna drives much of his personal growth throughout the story. He starts as a somewhat naive romantic dreamer but gradually develops more confidence and emotional understanding as he navigates young love. His journey forms the emotional core of the film and serves as a relatable entry point for viewers following the ensemble of high school friends.

• natsuki hashiba
• protagonist
• crush on anna
• romantic lead
• pure-hearted

Love is the central theme of Rainbow Days, explored through multiple romantic pursuits and the way feelings complicate existing friendships. Natsuki's pursuit of Anna anchors the main romance, while side stories involving Tomoya, Keiichi, and Tsuyoshi show different facets of young love. The film uses these relationships to highlight both the sweetness and awkwardness of first love during adolescence.

• central theme
• love
• romance
• young love
• first love

Tomoya Matsunaga is the charming ladies' man of the friend group in Rainbow Days, often using humor to deflect from more serious emotional moments. Beneath his confident, playboy exterior, he has genuine feelings for Mari, which reveal a softer side to his character. His arc demonstrates how even the most outwardly self-assured teens struggle with vulnerability when real feelings emerge.

• tomoya matsunaga
• ladies man
• charming
• mari
• playboy

Rainbow Days takes place in a typical Japanese high school, with Tokyo serving as the broader urban backdrop for the story. Much of the narrative unfolds within the school environment and surrounding city life, where the four main characters experience everyday high school moments, friendships, and romantic entanglements. The summer festival adds a vibrant cultural touchpoint that blends traditional Japanese customs with modern youth culture.

• setting
• tokyo
• japanese high school
• urban
• summer festival

Keiichi Katakura is the slightly mischievous, competitive member of the quartet who often serves as a foil to Natsuki in Rainbow Days. He adds rivalry and tension to the group dynamic, particularly because he also pursues Anna, creating romantic conflict with his best friend. His presence highlights the complicated loyalties and jealousy that can surface among friends during adolescence.

• keiichi katakura
• rivalry
• competitive
• foil to natsuki
• teenage angst

Tsuyoshi Naoe is the loyal otaku of the group in Rainbow Days, known for his intelligence and deep involvement in anime and cosplay culture. He has a girlfriend named Yukiko, which makes him a bridge between the group's friendship dynamics and the romantic subplots. His internal conflict over academic choices and his future adds a more grounded, decision-driven layer to the coming-of-age story.

• tsuyoshi naoe
• otaku
• cosplay
• yukiko
• academic pressure

Friendship is just as important as romance in Rainbow Days, with the bond among the four male leads driving much of the narrative. Their camaraderie provides emotional support through the ups and downs of high school, and the film shows how friendships evolve when romantic interests enter the picture. The group dynamic functions as both a comfort zone and a source of conflict, especially when jealousy or rivalry arises between the boys.

• friendship
• camaraderie
• group dynamic
• bond
• rivalry

Rainbow Days functions as a coming-of-age story by tracking the four boys through their final years of high school and into graduation. The characters face typical adolescent challenges, academic pressure, relationship confusion, and uncertainty about the future, that symbolize the broader transition into adulthood. Each of them grows in confidence and emotional maturity by the end, making the film a warm portrait of teenage self-discovery.

• coming of age
• adolescence
• high school graduation
• personal growth
• maturity

Rainbow Days is set in the present day, reflecting the contemporary experiences of modern Japanese high school students. The story captures the realities of adolescent life in today's society, including academic pressures, relationship dynamics, and current cultural touchpoints like cosplay and anime fandoms. This modern setting makes the characters' struggles and joys feel relatable to current audiences.

• present day
• modern
• contemporary
• japanese society
• high school students

Mari Tsutsui is Anna's protective best friend and an important secondary character in Rainbow Days. Her initial jealousy over Natsuki's attention toward Anna creates pivotal tension in the story, while her own developing feelings for Tomoya add another romantic layer to the ensemble. Through her arc, the film explores how friendship and jealousy can coexist in teenage relationships.

• mari tsutsui
• best friend
• jealousy
• protective
• anna

The summer festival is a vibrant cultural centerpiece in Rainbow Days, bringing together Japanese tradition and youthful excitement. It serves as a key social setting where romantic feelings are tested, friendships deepen, and memorable character moments occur. The festival reflects the blend of contemporary urban life and traditional customs that defines the film's setting in modern Japan.

• summer festival
• japanese tradition
• cultural setting
• matsuri
• celebration

The title Rainbow Days refers to the colorful, emotionally varied experiences of adolescence that the characters go through. Just as a rainbow emerges after rain, the film frames the messy and sometimes painful days of youth as leading to something bright and hopeful. A literal rainbow appears at the story's climax, reinforcing the idea that love, friendship, and growth emerge from adolescent struggles.

• title meaning
• rainbow
• symbolism
• adolescence
• optimism

Rainbow Days has a warm, hopeful tone that balances comedy with genuine emotional moments. Humor punctuates scenes of vulnerability, keeping the mood light even when characters face misunderstandings, jealousy, or awkward confessions. The film's optimism culminates in a happy ending, making it an accessible and uplifting watch rather than a dark or edgy drama.

• tone
• hopeful
• comedy drama
• warm
• optimistic