Sen Tokugawa is a fictional character from Hyakka Ryōran, the daughter of the 25th shogun Yoshiyasu and the younger sister of Yoshihiko Tokugawa, known by the nickname “Sen-hime.”
Sen Tokugawa is introduced as the proud and glamorous princess of the Tokugawa family.
She serves as the vice president of the student council at the Buou Academy Preparatory School and carries the inherited name of the historical princess Sen, daughter of Tokugawa Hidetada.
She is a childhood friend of Muneakira Yagyu, who frequently visits the Tokugawa household as a sword instructor.
However, after she enters the middle school division, her relationship with Muneakira grows distant.
During the Yagyu Dojo raid incident in the original storyline, Sen accidentally kisses Muneakira after he falls over.
This unexpected kiss causes her to form a contract with him and become his Master Samurai.
Following this, she is imprisoned by order of her brother Yoshihiko in an underground cell beneath the student council castle.
Muneakira and his allies rescue her, and afterward Sen chooses to live at the Yagyu Dojo.
In the anime adaptation, Sen already lives at the Yagyu Dojo even before becoming Muneakira’s Master Samurai.
During Kanetsugu Naoe’s attack, she willingly kisses Muneakira to gain Master Samurai powers, turning the event into a bold and deliberate choice rather than an accident.
As a princess of the Tokugawa family, Sen has very high pride and a strong sense of status.
She often behaves in a haughty and confident way, but this is mixed with genuine affection and concern for those close to her.
Her sense of luxury leads to very extravagant spending habits.
When her funds inevitably fall short, Hanzo Hattori secretly covers the deficit out of her own salary, highlighting both Sen’s recklessness with money and Hanzo’s devotion.
Despite her arrogance, Sen is easily flustered when it comes to Muneakira and shows a tsundere-like mix of prickliness and vulnerability.
This contrast between elegant princess and awkward girl in love is one of her most distinctive charms.
Sen becomes a Master Samurai through a kiss with Muneakira Yagyu, forming a powerful bond between them.
When she activates her Master Samurai state, she uses the transformation call “Tenga Ryu-Rei,” emphasizing her refined and graceful nature.
In her Master Samurai form, Sen’s outfit resembles that of Yukimura Sanada, while keeping her original body type and overall silhouette from the source material.
Her fighting style blends elegance and authority, fitting her position as a Tokugawa princess who takes the battlefield with dignity.
Sen’s primary weapon is a heavily ornamented naginata.
The decorative design reflects her status as nobility, but it is still a fully functional and deadly polearm.
She fights using wide, sweeping strikes and controlled movements, taking advantage of the naginata’s reach.
Her combat approach balances beauty and lethality, making her look more like a dancing noblewoman than a simple warrior.
Muneakira Yagyu
Muneakira is Sen’s childhood friend and later her Master Samurai partner.
Their relationship is complicated by years of distance, misunderstandings, and Sen’s proud personality.
The accidental kiss during the Yagyu Dojo raid (or her intentional kiss in the anime) drastically changes their connection.
From that point on, Sen must confront her real feelings for Muneakira while dealing with the embarrassment of being bound to him as his Master Samurai.
Yoshihiko Tokugawa
Yoshihiko Tokugawa is Sen’s older brother and the current shogun’s heir.
He orders her confinement in the underground prison beneath the student council castle, treating her as a political piece in his larger schemes.
This conflict introduces tension between Sen’s loyalty to her family and her own sense of justice and freedom.
Her eventual rescue by Muneakira and the others pushes her further away from blind obedience and closer to forging her own path.
Hanzo Hattori
Hanzo Hattori serves as Sen’s devoted retainer and bodyguard.
She is fiercely loyal to Sen, going so far as to pay for Sen’s overspending from her own salary.
Sen often takes Hanzo’s devotion for granted, but there is a clear bond of deep trust between them.
Hanzo’s unwavering support lets Sen act freely, knowing someone is always there to back her up.
Sen initially lives within the Tokugawa residence as a high-born princess and student council elite.
After her imprisonment and subsequent rescue, she chooses to reside at the Yagyu Dojo.
This move symbolizes her shift from sheltered nobility to a more independent and personally driven life.
By living with Muneakira and the others, she becomes more grounded while still maintaining her proud, princess-like demeanor.
Sen Tokugawa is voiced by Minako Kotobuki.
Her performance emphasizes both Sen’s regal arrogance and her softer, more vulnerable side, bringing out the character’s layered personality.
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