Rui Sagisawa

Rui Sagisawa (鷺澤 累, Sagisawa Rui) is a med-student at the Imperial University and the biological son of Shirou Mozuyama and Shouko Shiginuma.

Appearance
Rui is a tall young man with short grey hair, pale brown eyes and calm demeanor.

His casual wear consists of a white shirt with a red and blue ribbon to keep it in place. He wears burgundy braces over his shirt accompanied with dark trousers decorated with nadeshiko flowers near the hem of his left side. He wears pale grey socks and dark shoes to accompany his outfit.

As the leader of Kagutsuchi, he wears a black cape with a nadeshiko pin and a red scarf. He wears a black cap and sometimes a black mask to accompany this outfit.

Personality
Rui appears to be a kind, caring and trusting guy especially towards Tsugumi Kuze who is very ambitious about his goals that he would strive to fulfill them and he can also become a teaser.

Biography
Rui is the illegitimate son of Shirou Mozuyama and Shouko Shiginuma whom Shouko loved him very deeply, but her father felt embarrassed by having an illegitimate son in the family and took Rui away from her in order to protect their family name. Rui was given to Keiichi and Miyako Sagisawa (Shouko's close friends) who promised to protect and take care of Rui. He is a medical student, who works part-time jobs in between his studies while studying at the Imperial Capital University. He can often be seen reading in cafes, the park or the library, and he meets Tsugumi Kuze by coincidence.

Shirou Mozuyama
SHirou is Rui's biological father who raped Shouko twenty years ago, resulting in Rui's birth. Rui despises him, due to the fact that he experimented with "cursed tomes" on his classmates and friends which led him to form "Kagutsuchi". He was also horrified when Mozuyama revealed that he is his biological father and the one who caused the death of his adoptive parents. Rui refused to acknowledge Mozuyama as his biological father, as well as to join him in his criminal activities.

Shouko Shiginuma
Shouko is Rui's biological mother who was raped by Shirou Mozuyama twenty years ago, resulting in Rui's birth. Shouko loved Rui dearly, and was heartbroken when her father snatched him away from her to prevent the family name from being tarnished. Despite having not seen him for twenty years, Shouko still loved Rui from afar, even buying one of his handmade kaleidescopes. Shouko refused to acknowledge Mozuyama as Rui's biological father, declaring that Rui is her child and only hers. After Mozuyama was defeated, Rui cannot bring himself to acknowledge Shouko as his biological mother and he peacefully parts ways with her after she wishes him happiness.

Tsugumi Kuze
Rui met Tsugumi by chance when she started working at Fukurou. He immediately became smitten with her upon first encounter and took an interest in her job. They developed a friendly relationship, and Rui enjoyed teasing her to make her blush. However, Tsugumi, remained oblivious to his feelings and his advances towards her. When Tsugumi found out that he was the leader of "Kagutsuchi", he tried to convince her to join him, claiming that he needs her, but she refused as she couldn't accept his ways of dealing with "cursed tomes". Saddened by her refusal, Rui accepted her decision and vowed to meet her again.

They eventually met again at the "Flamant Rose" cafe, where he warned her about Takashi Shiginuma. Rui also makes it clear to Tsugumi that he won't give up on her. They met again at "Nachitigal" after Rui managed to defeat Shirou Mozuyama and he promised Tsugumi that he will stop burning books. When they encountered each other at a library, Rui asks Tsugumi to be by his side when he reopens his father's clinic which she shyly agrees.

Etymology

 * The name Rui means "Cumulative" (累).
 * Rui's surname Sagisawa means "heron" (鷺) (sagi) and "marsh" (澤) (sawa).

Trivia

 * Rui is skilled at hand-crafting jewelry, brooches and kaleidoscopes which he often sells at Kuina's shop
 * As the leader of Kagutsuchi, Rui is skilled at hand-to-hand combats
 * As mentioned by Shizuru Migiwa, Rui has a striking resemblance to Shouko Shiginuma.
 * Rui is a fan of Shizuru's novels
 * Rui is often seen reading in cafes, the park or the library
 * He also spends most of his studying in the library due to the expense of textbooks
 * Due to coming from a working-class background, Rui takes up part-time jobs to pay for his university expenses
 * Like Hayato Ozaki, Rui also fell in love with Tsugumi Kuze at first sight.