Karin Miyoshi

In D.E. 298, Karin, along with Kusunoki Mebuki, Miroku Yumiko, and numerous other girls, were chosen as Hero candidates to replace the recently-deceased Minowa Gin. The Taisha intended to train the candidates in hopes to pick one to be the next Hero while the others would eventually end up as Sentinels. During the two years of already intense training, Karin and Mebuki subjected themselves to an intense lifestyle on top of the already physically-demanding training they underwent were noted to have the highest marks of all the candidates. Unlike Mebuki, who actively isolated herself to continue her training, Karin would aid those in need by giving adivce on swordsmanship or taking the sick to the infirmary. Despite Mebuki having higher marks overall, in D.E. 300, the Taisha offically picked Karin to be the next Hero. Once she was christened as a Hero, Karin was assigned to the Sanshu Middle School Hero Club by the Taisha in order to oversee their activities.

In the second visual novel, Karin revealed that the reason she trained to become a Hero was that she constantly felt inferior to her older brother, who has a high position in the Taisha. Although Karin's family is still alive, she lives alone in an apartment complex.

Karin has brown hair, tied into two pigtails held by red and black ribbons. She has olive-green eyes. At school, she wears the standard school uniform with knee-length grey socks and black shoes.

In her hero form, her black and red ribbons are replaced with red, flower-shaped bows. Her outfit consists of a red, white and black dress with white lines and flower patterns on it, and black shorts underneath. She has a red flower pin on the left side of her chest and a pair of ribbons hang from the same shoulder in both the front and back. She has long, thigh-high boots that have a red and black gradient on it. Her gloves fade are a black and red gradient with white straps and lines. Her Mankai gauge, which resembles a Laurel flower, is located on her left shoulder.

Karin is depicted as a headstrong individual: stubborn, obstinate, and single-minded. She is very abrasive and finds it difficult when expressing her feelings towards others, resulting in her becoming distant towards her fellow companions. Her years of constant training have left her no time for making friends, and she claims to have never celebrated her birthday in her life. As a result, she is physically active and very intelligent, having scored near-perfect scores on her entrance exam. However, she can't resist helping whenever someone is having trouble, which is the reason she was chosen as a hero instead of Mebuki, who had slightly better grades in training. In terms of her abilities as a guardian of the Taisha, Karin is revealed to be very self-confident and positive, initially believing her skills are far greater than the other members of the Hero Club. During her first encounter with the Hero Club, Karin is quite repulsed and irritated by their carefree and optimistic behavior, viewing the four of them as unworthy of being Heroes. However, despite being a highly skilled and capable guardian of the Taisha, Karin, being the only Hero out of the five to not turn Mankai during battle, she begins to feel incapable and unprofitable of the Hero club, blaming herself for not being able to protect the other members. Although Karin often lashes out at people who act friendly toward her, such as Yuuna, she is eventually revealed to be a kind, lonely girl with an inferiority complex. She ultimately comes to care deeply about her new found friends, and, over the course of the series learns to be honest with her feelings. Karin ultimately becomes very close to the members of the Hero Club.