Aizen, Tokinada Tsunayashiro

The Great Spirit Library was dim and profound. Rows upon rows of shelves stretched deep into the distance, their ends nowhere in sight, packed with hefty books. Every book contained an event or piece of information concerning Soul Society. After millions of years of accumulation, the Great Spirit Library had become impossibly deep. It was silent, empty, and secluded, carrying an air of mystery. A voice like that of a ghost from the underworld echoed through the depths of the Great Spirit Library: "Why isn't there any...?