Help! I am bound to Aizen! Novel

Kaelith Yurei is a first-year student at the Shin'ō Academy in the Soul Society with modest ambitions: to graduate and become a seated officer in the Gotei 13 through hard work and dedication. His best friend, Sōsuke Aizen, is destined for greater fame and possesses far more ambitious ideals. Everything changes when Kaelith discovers an unexpected binding with Aizen—whenever Aizen increases his strength, Kaelith's power automatically synchronizes to match his level. This revelation transforms Kaelith's straightforward path. Now his survival and success depend entirely on pushing Aizen to train harder and grow stronger. With this binding in place, Kaelith's strategy becomes clear: he must encourage Aizen to work relentlessly, for only through his friend's continuous self-improvement can he achieve his own dreams of becoming a seated officer and living the life he desires.