Movie
Description
Karamatsu Matsuno is the second-born of six identical sextuplet brothers. In childhood, he exhibited a cheerful, carefree demeanor fueled by high-energy bravado or an "empty spirit" (karagenki). His impulsive tendencies frequently caused misfortunes and unintended trouble for himself and others. Despite being a crybaby with perceived low intelligence (playing on "karappo" meaning empty), he revealed artistic inclinations through painting and skilled sewing. He demonstrated occasional tidiness and responsibility while caring for mechanical devices or a pet goldfish, though moments of gluttony resulted in stomachaches. His childhood bond with Todomatsu involved frequent joint misadventures, with Todomatsu often blaming him for their troubles.

During adolescence, chronic acne led Karamatsu to adopt a subdued, worried expression. He struggled to establish individuality within the group and attempted to mediate brotherly conflicts, though these efforts typically failed. A pivotal moment occurred when his future self gifted him sunglasses and falsely promised a girlfriend, cementing his path toward a dramatic persona.

In adulthood, Karamatsu cultivates a distinctive style: rolled-up sleeves, blue clothing, thick eyebrows, and signature blue sunglasses—often broken by his brothers. He favors leather jackets with skull motifs, bedazzled items, and clothing featuring his own face. His personality revolves around a self-perceived "cool" image expressed through poetic language and confident one-liners, largely ignored or mocked by others. This earns him the derogatory nickname "Kusomatsu" (Shittymatsu) from his brothers, particularly Ichimatsu. Despite projecting confidence, he is socially oblivious and takes situations overly seriously. Beneath this facade, he harbors deep insecurity and loneliness, feeling overlooked by his family—exemplified when his brothers make no effort to rescue him from kidnapping over an unpaid oden bill, causing emotional distress.

Moments of vulnerability reveal his internal conflict: he admits to Choromatsu that his brothers' meanness makes him want to "kill them at times," and his voice shifts higher when nervous, exposing timidity. Easily intimidated, he complies with demands under minor pressure, rationalizing this as being "the nicest person in the world." He craves validation and familial connection, expressing jealousy over perceived preferential treatment toward Todomatsu and longing for meaningful relationships.

In the film, Karamatsu's regret becomes the narrative catalyst. During a high school reunion, the brothers lie about their NEET status, resulting in humiliation. Transported to a "world of memories" on their graduation eve, they must resolve a regret to return home. Karamatsu confesses he found a letter addressed to "Matsuno-kun" from classmate Takahashi but lost it during a rooftop fight with his brothers. He believes its unread contents could have altered their fates. The brothers search for Takahashi, each hoping to be her secret admirer, only to discover the letter is blank—reflecting their collective inability to recall its words. This journey forces Karamatsu to confront his younger self's isolation and his role in the brothers' fractured dynamics.

His adult relationships remain complex: Osomatsu views him as amusement; Choromatsu finds his affectations embarrassing; Ichimatsu openly antagonizes him; Jyushimatsu maintains neutral but distant interactions; and Todomatsu is mortified by his behavior. Karamatsu persists in seeking approval through conversations and gestures of care that are routinely rebuffed.