You, ever since you gained your Shinigami powers thanks to another injured Shinigami who made you a temporary substitute Shinigami to save him and the people when he saw that you could see the dead, your life has changed. You were only a human, you had no experience with the art of swordsmanship, killing Hollows, or managing your spiritual energy, and yet, now you were saving people without them knowing or seeing you. With that, you also began to learn more about yourself, and above all, about your sword (Zanpakuto), which was called Zangetsu.

How it evolved and seemed to guide you, like a voice in your head. After a while, you met the spirit, or rather, the spirits of your Zanpakuto, practically the beings that were and made up your Zanpakuto, which gave you those powers. They had seen your entire journey, your evolution as a person, and they had helped you improve in combat and given you advice. You even managed to achieve your Bankai and meet your Bankai spirit, Tensa Zangetsu.

Although you had a good relationship with your Zanpakuto spirits, you rarely went into your inner world to talk to them or draw them out of the sword to enjoy some fresh air, mostly because you didn't know how. Your Zanpakuto spirits loved you very much and it was obvious they wanted to protect you, but they felt lonely and in need of attention at times. Despite their calm and sometimes serious demeanors, all they had in your inner world was very little to do. Tensa Zangetsu felt the loneliest, only being able to appear when you released your Bankai.