Description
Kotaro Satō, a four-to-five-year-old boy, resides alone in apartment 203 of the Shimizu Apartments complex. He projects fierce independence, capably handling cooking, cleaning, shopping, and budgeting without adult help. His speech is formal and archaic, often using samurai-like terms such as "warawa" for himself, influenced by his favorite animated character, Tonosaman; he frequently carries a plastic toy sword.
This independence and mature demeanor stem from a traumatic childhood of parental neglect and abuse. His mother was openly neglectful, rarely providing care and wearing cleaning gloves when touching him. She abandoned Kotaro and his father, later dying from unknown causes. His father became physically abusive towards both Kotaro and his mother, eventually declaring he no longer loved Kotaro. After placement in a foster facility, Kotaro fled upon learning his father located him through an online photograph. He moved into Shimizu Apartments under the alias "Satō" to hide; his real name is Koutarou Namiki. A restraining order exists against his father, who continues searching for him.
Kotaro receives weekly financial support from lawyer Ayano Kobayashi, delivering money from his deceased mother’s life insurance policy. Unaware of his mother’s death, Kotaro believes the funds come from a benefactor, though he occasionally expresses suspicion about their origin. His traumatic past manifests in specific behaviors: he eats tissues as a survival habit from periods of starvation, and his samurai persona serves as a coping mechanism to appear strong and self-reliant. He initially believes becoming "stronger" will reconcile his father’s affection.
Relationships with neighbors at Shimizu Apartments reshape his world. Shin Karino, a manga artist next door, evolves from a reluctant observer into a primary caregiver, providing emotional support and accompanying Kotaro to kindergarten. Isamu Tamaru, a neighbor often mistaken for yakuza, seeks a father-figure role but is rebuffed by Kotaro, who recognizes Isamu’s unresolved estrangement from his biological son. Mizuki Akitomo, a hostess, acts as a nurturing figure before moving away due to her domestic abuse situation, which Kotaro helps expose. Kotaro also befriends Ryōta, an older boy from the foster facility who shares his interest in stargazing.
A significant development occurs when Aota, a private investigator hired by Kotaro’s father, infiltrates the complex. After bonding with Kotaro, Aota—a survivor of child abuse himself—abandons his mission upon seeing Kotaro’s scars. This incident reinforces Kotaro’s distrust of adults but deepens his neighbors’ protective commitment. Over time, Kotaro confronts his trauma: he acknowledges his father as a "bad guy," processes his mother’s abandonment, and shifts from seeking parental reconciliation to desiring a shared home where he and his friends can live together. His growth includes learning to accept help and express vulnerability, symbolized by using his real name on his apartment nameplate.
This independence and mature demeanor stem from a traumatic childhood of parental neglect and abuse. His mother was openly neglectful, rarely providing care and wearing cleaning gloves when touching him. She abandoned Kotaro and his father, later dying from unknown causes. His father became physically abusive towards both Kotaro and his mother, eventually declaring he no longer loved Kotaro. After placement in a foster facility, Kotaro fled upon learning his father located him through an online photograph. He moved into Shimizu Apartments under the alias "Satō" to hide; his real name is Koutarou Namiki. A restraining order exists against his father, who continues searching for him.
Kotaro receives weekly financial support from lawyer Ayano Kobayashi, delivering money from his deceased mother’s life insurance policy. Unaware of his mother’s death, Kotaro believes the funds come from a benefactor, though he occasionally expresses suspicion about their origin. His traumatic past manifests in specific behaviors: he eats tissues as a survival habit from periods of starvation, and his samurai persona serves as a coping mechanism to appear strong and self-reliant. He initially believes becoming "stronger" will reconcile his father’s affection.
Relationships with neighbors at Shimizu Apartments reshape his world. Shin Karino, a manga artist next door, evolves from a reluctant observer into a primary caregiver, providing emotional support and accompanying Kotaro to kindergarten. Isamu Tamaru, a neighbor often mistaken for yakuza, seeks a father-figure role but is rebuffed by Kotaro, who recognizes Isamu’s unresolved estrangement from his biological son. Mizuki Akitomo, a hostess, acts as a nurturing figure before moving away due to her domestic abuse situation, which Kotaro helps expose. Kotaro also befriends Ryōta, an older boy from the foster facility who shares his interest in stargazing.
A significant development occurs when Aota, a private investigator hired by Kotaro’s father, infiltrates the complex. After bonding with Kotaro, Aota—a survivor of child abuse himself—abandons his mission upon seeing Kotaro’s scars. This incident reinforces Kotaro’s distrust of adults but deepens his neighbors’ protective commitment. Over time, Kotaro confronts his trauma: he acknowledges his father as a "bad guy," processes his mother’s abandonment, and shifts from seeking parental reconciliation to desiring a shared home where he and his friends can live together. His growth includes learning to accept help and express vulnerability, symbolized by using his real name on his apartment nameplate.