Tatsuya is really talented but also a bit of a slacker. Since middle school, Kazuya has received awards and recognition for excellence as a pitcher and baseball player. Tatsuya, however, is more inclined to let his brother take the limelight, as he is unwilling to directly compete with Kazuya. This includes Minami as well; while most people (including their parents) suggest that Minami and Kazuya will make a perfect couple, Minami tends to prefer Tatsuya.
In the story, Tōma Kamijo is an ordinary high school boy with terrible academic scores and a power called Imagine Breaker. Imagine Breaker can defeat any other power, but it also undermines Kamijo's own good luck. His Imagine Breaker's immense strength is literally immeasurable, so hapless Kamijo is listed at the supernatural level of 0. He happens to meet a girl in white hanging off his window balcony. The girl says she is being chased by sorcerers, and Kamijō learns that the girl is a Church of England nun whose memories have been forcibly replaced by Index- Librorum-Prohibitorum - the 103,000 forbidden texts of the Church.
