In Japan’s “twilight” period, during the Meiji restoration, widower, Iguchi Seibei leaves work each night at twilight to go home to his aging mother and two young daughters rather than out drinking and carousing with his coworkers. Though he’s only a low ranking soldier, the position holds more distinction better than his current duties as a warehouse bookkeeper but ut since his wife’s funeral was so expensive he cannot afford to take a new bride as he pays off the funeral expenses.
Then Tomoe, the sister of a childhood friend comes to stay to get away from her high-ranking abusive husband, who suddenly shows up in the middle of night. Seibei is forced into a duel but manages to overcome despite having the flimsier weapon. This victory wins Seibei the respect of higher ranking officials, who want him to revisit the violence of his former profession. Meanwhile, his friend urges him to marry even though it would be a mismatch; Seibei supplements his income by making bug cages in his spare time and has been neglecting his personal hygiene. However, he loves Tomoe and she’s grown fond of his senile mother and two sweet daughters. Torn between loyalties yet bound by honor and tradition, Seibei is forced to fight.