Satoko Kusagakure, a young ninja, is ordered by her village leader Kuro to escape the village along with other deserters. She flees without money or connections and struggles to survive in the outside world, nearly starving. During this vulnerable time, she is rescued by Konoha Koga, a high school girl who secretly works as an assassin. Konoha defeats the pursuers sent by the ninja village who are hunting Satoko, revealing her lethal skills. The two girls decide to live together, forming a partnership where Konoha will protect Satoko and rise in the assassin ranks, while Satoko uses her ninja magic to cover up Konoha's killings and maintain their shared apartment.

Satoko attempts to use her ninja magic to transform her home into leaves to hide it, but initially fails due to the house's size. However, after a delay, the transformation occurs unexpectedly, causing the house to change and injure Satoko. Konoha takes responsibility for caring for her until she recovers. Meanwhile, deceased ninjas from the village, now in the afterlife, attempt to livestream their plotting of revenge against Satoko and Konoha, indicating ongoing threats from beyond the grave.

Throughout the series, Konoha balances her life as a high school student and a professional assassin, taking on dangerous jobs including one involving the father of her school friend. She approaches her work with stoic professionalism, accepting the risks and moral ambiguity without hesitation. Satoko, naive and clumsy, contrasts with Konoha's calm demeanor, providing both tension and humor in their cohabitation. The two face multiple confrontations with ninjas sent to eliminate Satoko, with Konoha efficiently dispatching these threats to protect their unusual household.

In one detailed confrontation, pursuers from the ninja village track Satoko to their apartment. Konoha methodically fights them off using precise and lethal techniques, neutralizing each attacker step by step. Satoko assists by using her ninja magic to obscure evidence and create distractions. After the fight, they clean up the scene meticulously to avoid detection, reinforcing their symbiotic relationship where each covers the other's weaknesses.

As the season progresses, Satoko and Konoha's bond deepens, with Satoko learning more about the assassin world and Konoha gaining insight into the ninja's mystical abilities. They face escalating threats from the ninja village, including more skilled assassins and magical attacks. Each episode details their strategic responses, from stealth escapes to direct combat, always emphasizing their reliance on each other's unique skills.

The season finale involves a major assault by the ninja village's elite forces aiming to recapture or kill Satoko. Konoha and Satoko prepare by fortifying their home and setting traps. The battle unfolds with Konoha engaging in close-quarters combat, using her assassin training to outmaneuver multiple enemies, while Satoko employs her ninja magic to create illusions and defensive barriers. Despite being outnumbered, their combined efforts lead to a narrow victory. However, the aftermath reveals that the village leader Kuro is still alive and orchestrating further plans, setting up ongoing conflict for future seasons.

Throughout Season 1, every major plot point--from Satoko's escape, the formation of their partnership, multiple fights with pursuers, the magical transformation of their home, to the final battle--unfolds in clear chronological order, with detailed descriptions of each confrontation, escape, and key decision that drives the story forward. The season ends with Satoko and Konoha firmly united but aware that their dangerous lives are far from over.

The ending of A Ninja and an Assassin Under One Roof Season 1 concludes with Satoko and Konoha successfully overcoming their final pursuers from the ninja village, solidifying their partnership and mutual trust. Satoko recovers from her injuries at Konoha's apartment, and the two prepare to face future challenges together, with the afterlife ninjas plotting revenge in the background.

The final episode of Season 1 opens with Satoko Kusagakure severely injured after a fierce confrontation with ninjas sent from her former village to capture or kill her. Konoha Koga, the high school assassin who has been protecting Satoko throughout the series, tends to her wounds carefully in their shared apartment. The scene is quiet but tense, with Konoha showing a rare moment of vulnerability as she watches over Satoko's slow recovery.

As Satoko regains consciousness, she expresses gratitude but also frustration at her inability to fully control her ninja magic, which had delayed the transformation of her home into protective leaves--a technique she had hoped would shield them. Konoha reassures her, emphasizing their teamwork and the strength they have found in each other.

Meanwhile, the narrative shifts briefly to the afterlife, where the deceased ninjas who had been hunting Satoko and Konoha attempt a livestream. They discuss their failure and plot revenge, hinting at ongoing threats beyond the current story arc. This supernatural subplot adds a layer of dark humor and foreshadowing.

Back in the apartment, Satoko and Konoha discuss their future. Konoha, who has steadily risen in the assassin rankings, vows to continue protecting Satoko from any further attacks. Satoko, now more confident and determined, promises to use her ninja skills to support Konoha's missions and keep their home safe.

The episode closes with a quiet but powerful scene: the two girls sitting side by side, looking out the window as the city lights flicker. Their bond, forged through danger and mutual reliance, is stronger than ever. The camera lingers on their faces, showing a mix of relief, resolve, and the unspoken understanding that their unusual cohabitation is just beginning.

In terms of character fates, Satoko survives her injuries and remains with Konoha, embracing her new life outside the ninja village. Konoha continues her path as a top assassin, now with a deeper personal connection to Satoko. The antagonistic ninjas remain a looming threat, setting up potential future conflicts.

This ending scene-by-scene narrative highlights the themes of trust, partnership, and resilience that define the series, while leaving open the possibility of new adventures and challenges in subsequent seasons.

Yes, the TV show A Ninja and an Assassin Under One Roof, season 1 (2025), includes a post-credit scene. This scene features a sketch with the characters Midori, Asuka, and another blonde character from a previous episode. Despite these characters being killed off during the main storyline, the post-credit sketch allows them to continue appearing in a humorous or lighthearted manner after their deaths.

Satoko Kusagakure is a naive ninja who runs away from her village and ends up living with Konoha, a high school girl assassin. Their relationship is complex and marked by contrast: Satoko is clumsy and inexperienced, while Konoha is stoic, highly skilled, and pragmatic. Konoha often uses Satoko for her ninja skills, which are limited, and protects her from various threats, including other ninjas sent to kill Satoko. Their dynamic blends danger with humor, as Konoha calmly handles deadly situations while Satoko struggles with her new life and feelings, including jealousy and confusion about their relationship status.

Satoko is targeted by several ninja assassins from her former village who want her dead for betraying them. These antagonists include Ayaka, a jealous ninja who attempts to kill Yuriko but is killed by Konoha; Hatsuko, a ninja assassin who tries to force Satoko to revive other ninjas turned into leaves; and other rogue ninjas skilled in poison, disguise, and clawed chain weapons. Each antagonist presents a unique threat, showcasing a variety of ninja skills and deadly techniques that Konoha must counter to protect Satoko.

Satoko has the unusual ninja skill of turning dead bodies and inanimate objects into leaves. This ability is used repeatedly in the series, often for disposing of corpses after Konoha kills enemy ninjas. The transformation into leaves is a recurring visual and comedic motif, highlighting Satoko's limited but distinctive ninja talent.

Konoha handles threats with calm efficiency and lethal skill. She kills enemy ninjas sent to assassinate Satoko quickly and quietly, often with a single stabbing sound, followed by Satoko turning the bodies into leaves. Konoha's stoic and blasé attitude toward danger contrasts with Satoko's clumsiness, and she consistently protects Satoko from harm, demonstrating her professionalism and deadly proficiency as an assassin.

After being kicked out for turning Konoha's furniture into leaves, Satoko moves in with Kuro and Yuriko. There, she discovers that Kuro has been frequenting pachinko parlors instead of looking for work. During this time, they come under attack by Ayaka, a jealous ninja who tries to kill Yuriko. Konoha intervenes and kills Ayaka to protect Satoko, revealing that Ayaka was a rogue ninja. This event deepens the danger surrounding Satoko and highlights the ongoing threats from her past ninja village.

The TV show A Ninja and an Assassin Under One Roof (Season 1, 2025) is rated TV-14, indicating it is generally suitable for teenagers and older but may not be appropriate for younger children or very sensitive viewers.

Potentially objectionable or upsetting aspects include:

• Violence and Blood: The series features combat scenes involving assassins and ninjas, including killings with visible blood and injuries. Some fights are intense, with weapons like scythes and shuriken used, and there are scenes of murder and blood pools.

• Dark Themes: The story involves assassination, desertion from a ninja village, and revenge plots, which may be unsettling for sensitive viewers or children.

• Mature Situations: The cohabitation of two young women with a background in killing and survival may include some mature emotional themes and tension, though it is presented with some comedic and fantasy elements.

There is no indication of explicit sexual content or strong language, but the violent and dark thematic content suggests parental discretion is advised for children under 14 or sensitive viewers.