Kizuna Kazayama/Relationships

Other Legendary Heroes (Glass' World)
Kizuna was summoned before the other three heroes, to deal with the rogue demon dragon, as she was hunting heroes. She was thrown in the dungeon by the enemy country before the other heroes was summoned to fend off the waves. So she was unaware of them.

After returning home, she learned about the other heroes from her comrades and tried her best to get them on her side to fight the waves. Kizuna was the only one who had her act together and understood why the other heroes treated this like a game. She failed miserably to convince them to side with her in fighting the waves. She held many meetings as possible to gain their co-operation but failed. She finally understood the hardships faced by Naofumi in regards to his relationship with the cardinal heroes of his summoned world.

Naofumi Iwatani
Kizuna met Naofumi and Rishia inside the labyrinth and was thrilled to have them, as she had been stuck there alone for years without anyone to talk. She tried to befriend them but Naofumi held his suspicion on her. They exchanged their stories and come to better terms. Naofumi helped her to escape the labyrinth and unite with her friends. She was amazed by his business and negotiating skills.

She was stressed by Naofumi's untrusting nature and asked him to have little faith in others. Both of them felt that the research of ancient text to be flawed with too many loopholes. They accepted to work together in saving both the worlds together and parted in better terms.

Glass
Glass is Kizuna's closest friend and first partner in Glass' World. As heroes, they fought together against the waves and joined forces with other heroes. At one point Glass gave Kizuna a haori which Kizuna deeply treasured even during her extensive time trapped in the Infinite Labyrinth. She wore the haori even to the day of her escape. When Kizuna was captured and placed under the curse of sloth, Glass desperately looked to save Kizuna. Under the curse of sloth, Kizuna hinted that Glass may rely too much on Kizuna's support.

Altorese
He is one of Kizuna's friends, but she doesn't fully trust him and always considers him a cunning businessman who chases profits alone.

Tsugumi
After Tsugumi had been saved by Kizuna and Naofumi, she acts as Kizuna's ambassador in order to repay Kizuna's kindness. Kizuna enjoys spending time with Tsugumi because her name reminds Kizuna of her older sister Tsumugi.