Jellyfish (2013) Characters, Setting & Themes Explained

Masashi Kusakabe is the protagonist, a sad but resilient boy who moves to a new suburban town with his mother after his father's death. He puts on a cheerful front to protect his mother, then discovers Kurage-bo, a jellyfish-like creature that becomes his closest companion. Throughout the story, Masashi learns to value friendship and courage while navigating peer pressure and danger from the Black-Cloaked Four.

• masashi kusakabe
• protagonist
• main character
• resilience

The story takes place in a quiet suburb bordered by lush green rice paddies, near a university research center and a shrine. This peaceful-looking town hides secrets beneath its surface, with the research center playing a central role in the mysterious events involving F.R.I.E.N.D.s devices and the Black-Cloaked Four.

• suburban town
• rice paddies
• research center
• setting
• location

Kurage-bo is a mysterious jellyfish-like creature that Masashi befriends. It communicates without words, loves chee-kama, and helps protect Masashi throughout his journey. The creature embodies the otherworldly, mysterious side of the town's strange energy. Its fate, vanishing and later being reunited with Masashi, drives the emotional core of the story.

• kurage-bo
• jellyfish creature
• companion
• mysterious entity

Friendship is the central theme, shown through Masashi's bond with Kurage-bo and his growing connection with Saki. The introduction of F.R.I.E.N.D.s devices tests loyalty and trust among classmates. The story demonstrates how true connection helps people face danger and loneliness, especially in unfamiliar surroundings, with friendships ultimately anchoring characters and guiding their decisions.

• friendship
• loyalty
• trust
• bonds
• connection

F.R.I.E.N.D.s are mysterious devices that appear in the story, creating manufactured 'friendships' among characters. They contrast with the genuine connections Masashi forms with Kurage-bo and Saki. These devices become central to the power struggle, as the Black-Cloaked Four and the research center attempt to weaponize energy and control children's friendships for their own ends.

• f.r.i.e.n.d.s
• devices
• technology
• manipulation
• control

The Black-Cloaked Four are a cult-like group that serves as the primary antagonists. Members include Tatsuya and Juran, who conspire against Masashi and participate in kidnapping Kurage-bo. They represent the antagonistic force pressuring Masashi and illustrate the group's willingness to sacrifice others for their goals. Their coordinated efforts threaten authentic bonds in the town.

• black cloaked four
• antagonists
• villains
• cult
• antagonists group

Saki is a classmate who reveals her own F.R.I.E.N.D.s and shares her family troubles with Masashi. She becomes a key ally, helping expose the truth behind the devices and the research center's schemes. Her evolving bond with Masashi demonstrates that friendship can help people cope with hardship, and her role emphasizes the theme that genuine connections are worth fighting for.

• saki
• ally
• classmate
• supporting character
• bond

The university research center is a key location where experiments involving the F.R.I.E.N.D.s devices take place. Masashi's uncle Naoto works there and cautions about the town's dangers before becoming entangled in the center's schemes. The center represents the darker side of scientific ambition, as a cult-like group seeks to weaponize energy and control children for their own ends.

• research center
• experiments
• conspiracy
• scientific ambition
• naoto

The movie portrays belonging as something earned through genuine care rather than devices. Masashi and Saki form real connections that contrast sharply with the manufactured 'friendships' created by the F.R.I.E.N.D.s devices. The Black-Cloaked Four's interference threatens authentic bonds, highlighting how fragile belonging can be under manipulation. The resolution restores community based on trust and mutual support.

• belonging
• manufactured friendships
• authenticity
• community
• manipulation

The story examines the power dynamics behind the F.R.I.E.N.D.s devices and the research center's experiments. A cult-like group and the Black-Cloaked Four seek to weaponize energy and control children's friendships for their own ends. Masashi and his friends learn to resist manipulation and rely on human bonds instead of coercive power. The ending warns about unchecked scientific ambition and stresses responsible use of power.

• power
• control
• manipulation
• scientific ambition
• resistance

Naoto is Masashi's uncle who works at the local research center. He cautions Masashi about the town's dangers but becomes entangled in the center's schemes. A duplicitous version of him plays a pivotal role in the conflict, adding familial tension to the unfolding events. His involvement illustrates how even trusted family members can become compromised by the town's mysterious forces.

• naoto
• uncle
• research center
• family
• betrayal

Koh is a boy living in an orphanage who uses Ko2, an anime character, in battles and ultimately helps restore the F.R.I.E.N.D.s. After the conflict, he chooses to reconnect with friends and contribute to mending the community. Koh's arc emphasizes resilience and communal rebuilding, showing that even those on the margins can play a hero's role in restoring harmony.

• koh
• orphan
• supporting character
• resolution
• resilience

Despite featuring frequent action sequences, dangerous conspiracies, character injuries, and even a death, the story maintains a hopeful core focused on friendship. The ending is decisively happy: the threat is vanquished, all F.R.I.E.N.D.s are restored, and the community is reunited. This fosters a strong sense of hope and unity, with the darker elements serving the adventure rather than dominating the emotional weight.

• emotional tone
• ending
• hope
• unity
• resolution