Shiki Koshiyama

Shiki Koshiyama (越山 識 Koshiyama Shiki) is the main protagonist of the Nana Maru San Batsu series. He is a first-year student at Buzō Prefectural High School who is a member of Buzō's quiz circle. After meeting Gakuto Sasajima and Mari Fukami, he was introduced to the world of competitive quizzes.

Appearance
Shiki is a young man with medium length light brown hair, light brown eyes and oval-shaped glasses.

He wears the Buzō High School school uniform.

Personality
When first introduced, Shiki is a shy and introverted young man who often has difficulty speaking up for himself due to his low self-esteem. As such, he prefers to spend his time alone so as to not stick out and deal with others who like to bully.

From a young age, Shiki has developed a passion for reading, often consuming any books he can find and spending most of his time in the library. Because of this, he has developed an encyclopedic knowledge on a variety of different topics, something that becomes invaluable during quiz matches. Shiki is also extremely intelligent in his own right, able to use his critical thinking skills along with his vast knowledge to answer some the toughest questions without knowing the direct answer.

After joining the quiz circle, Shiki becomes much more open and expressive as he finds an activity that he feels passionate about. It's during this time that he develops a more competitive spirit and starts taking more risks during matches.

Skills
Shiki has extensive knowledge from reading books since young and also able to remember the contents of the books he has read once. His ability comes to him naturally as he himself believes that it was natural for an individual to remember books they have read-only once.

An instance of his incredible memory can be seen in Episode 12 of the anime and in Chapter 27 of the manga. Shiki was able to answer a quiz question by recalling small details of events from different books and the culture of the era, arriving to the correct conclusion.

Trivia

 * The name Shiki means "insight" (識).
 * Shiki's surname Koshiyama means "beyond" (越) (koshi) and "mountain, hill" (山) (yama).
 * Shiki is in Class 1-D and is classmates with Mari Fukami, Daisuke Inoue and Yoshikatsu Kuroda.
 * During middle school, Shiki was the class librarian for all three years that he reads mostly classical literature and non-fiction books during his time there.
 * Shiki has extensive knowledge of books he read, believing that it was natural to know the contents of the book after reading it once.
 * Shiki specialties are in Literature and History.