Unlike both Akio and Naoko, Shirou has a serious and diligent personality, and is quite concerned with following the rules. This has lead to an initial rejection of Naoko's confession, but after going through more of her advances, he finally accepted her love, although he never seemed to invested in the relationship, not even caring that his girlfriend had another lover aside from him. He even admitted that Akio loved Naoko more than him. Even so, he readily helped during the students' fight against the Manticore, and was able to do quite a bit of damage to it with his archery skills, showing that he is a capable person, even in precarious situations.
Shirou is a short young man with light brown hair and brown eyes. He is shown wearing the archery club's uniform.
In the anime, Shirou has short, straight black hair in a bob haircut and brown eyes. He is shown wearing the Shinyo Academy male school uniform and the archery club unifrom.
During his first year of high-school, Shirou was approached by Naoko, who confessed her love to him. Akio Kimura happened to see the confession, and saw how Naoko was rejected as Shirou ran away. Later, after many more confessions, Shirou finally agreed to be Naoko's boyfriend.
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- Shirou's last name, Tanaka, can be translated as "the middle of the rice field", and is one of the most common Japanese surnames.
- Shirou's first name is written with the characters for "plan" and "son".