What is the plot?

Hotaru Kusakari and Gorō Kusakari are introduced as an ordinary married couple living a normal domestic life in Japan, with Hotaru working as a pharmacist and Gorō working as a postal delivery man, and each of them believing the other is simply a normal civilian spouse.

In truth, Hotaru is a ninja from the Kōka clan, and she conceals that identity while behaving with deliberate restraint, calmness, and caution in public so her true background is not exposed.

Gorō is revealed to have the same kind of secret life: he is also a ninja, but from the rival Iga clan, and he too keeps his identity hidden from Hotaru.

Their marriage begins from genuine affection, but once they are living together, everyday friction starts to wear down the relationship, with their compatibility deteriorating over ordinary domestic problems such as chores and even bathroom use.

As this tension grows, the story's central pressure increases because the couple are not only spouses with strained trust but also members of hostile ninja families whose rivalry has existed for generations.

The plot then turns on an assassination incident, which forces both Hotaru and Gorō out of their comfortable ignorance and into a situation where they must confront the conflict between their marriage and their clan loyalties.

From that point, the decisive issue becomes whether they will protect their relationship as husband and wife or side with the obligations and expectations tied to the Kōka and Iga families.

What is the ending?

Short version: Hotaru and Gorō, who have spent the story hiding that they are rival-clan ninjas from each other, reach the end of their separation and face the truth of who they are. By the ending, they choose to confront the conflict between their marriage and their ninja families, and they end on a path toward staying together rather than giving each other up.

Now the ending in a more expanded, scene-by-scene narrative:

The final stretch begins with the marriage already badly strained. Hotaru is no longer standing quietly inside the life she built with Gorō; she is coming back with purpose, and Gorō is caught between hope and fear as he faces what her return means. When he finds that she is not there to reconcile in the way he wants, he is confronted with a divorce form instead, and the shock lands heavily on him.

After that, Hotaru returns home and Gorō reacts with visible relief at first, thinking she has come back to stay. That relief disappears when Hotaru makes it clear that she has come for the divorce papers. Gorō pleads with her not to end the marriage. He tells her that, despite everything, he does not want to divorce her and that he will change. Hotaru does not soften. Gorō breaks down crying, and after that emotional collapse he reluctantly says he will sign the papers. Hotaru, fighting back tears of her own, leaves.

The story then moves into the last movement of the ending, where the distance between them does not stay absolute. Even with the divorce papers and the hurt between them, the ending does not close on permanent separation. Gorō later believes Hotaru in a moment that brings both of them relief, showing that trust is still possible between them despite the secrecy and conflict that have surrounded their marriage.

From there, the ending turns toward a direct question of whether they will separate as rivals or remain husband and wife. Gorō asks Hotaru whether she wants to start over, and he says he wants to make a real effort. The final part of the story is built around that choice: instead of ending as a clean breakup, the ending points them back toward each other and toward trying again together.

The fate of the main characters at the end is this: Hotaru ends the story still alive, still carrying her identity as a ninja, but no longer simply hiding inside a false ordinary life; she is forced to face the marriage honestly. Gorō also survives and remains in the story as her husband, still a ninja from the rival clan, but emotionally broken down and then drawn back toward recommitting himself to the marriage. Their relationship is left as the central unresolved-but-renewed bond at the end, with both characters choosing the possibility of staying together over a final split.

Is there a post-credit scene?

There is no evidence in the available sources of a post-credit scene for Marriage Is Difficult for a Ninja. The only credit-related result provided is an end-credits video, which indicates the ending credits song/version but does not describe any extra scene after the credits.

The series premise confirms the show is a 2023 Fuji TV drama about two ninjas from rival clans who marry and hide their identities from each other, but none of the supplied sources mention a post-credits tag or bonus scene.

If you want, I can also help check whether the final episode has a mid-credits or after-credits scene specifically, based on episode guides or fan recaps.

How do Hotaru Kusakari and Goro Kusakari each hide their true ninja identities from one another after getting married?

Hotaru presents herself as a quiet, ordinary pharmacist, but that calm image is only a cover for her real life as a descendant of the Koga ninja clan. Goro, whom she believes to be an ordinary man, is also secretly tied to a rival ninja world, so both characters are constantly managing double lives inside the marriage.

What specific details show that Hotaru is more than just a reserved pharmacist?

Hotaru's ordinary job and restrained manner hide a much tougher inner personality. The series description says she is actually feisty, perfectionistic, and strongly opposed to failure, and that she keeps up stoic jogging and training every morning to maintain her physical prowess.

What is the significance of the Koga clan in Hotaru’s story?

Hotaru is explicitly described as a descendant of the Koga Ninja clan, and the series frames that inheritance as central to her identity. Even while working in a pharmacy and trying to live normally, she remains proud of that lineage and struggles with how it fits into her marriage and her wish for a normal household.

How does the marriage between Hotaru and Goro create tension in the story?

The marriage is built on secrecy because both spouses are living hidden ninja lives, and the central tension comes from trying to behave like a normal married couple while concealing the truth from each other. The setup makes the relationship itself part romance and part deception, with the secrecy constantly undercutting ordinary domestic life.

What kind of rival-clan conflict is built into the characters’ relationship?

The core conflict comes from the fact that the two married ninjas come from rival clans, which means their relationship sits inside a larger family and clan opposition. That rivalry forces them to balance personal feelings against inherited loyalty and the risk of exposure.

Is this family friendly?

Marriage Is Difficult for a Ninja appears mostly family-friendly in the sense that it is a live-action romantic comedy about two secretly married ninjas, with no obvious indication from the synopsis of graphic content or extreme themes.

Potentially upsetting or objectionable elements for children or sensitive viewers may include: - Action/violence related to the ninja premise, which likely includes fighting, weapons, or stealth-based conflict. - Secrets, deception, and marital tension, since the central premise involves both spouses hiding their true identities from each other. - Rival clan conflict, which may add suspense, threats, or confrontational scenes.

I could not verify from the provided sources whether it includes strong language, sexual content, gore, or other specific content warnings, so I would treat it as a mild-to-moderate family viewing choice rather than clearly child-targeted programming.