Kizuna Kazayama/Relationships

Other three cardinal heroes
Kizuna was summoned before the other three heroes, to deal with the rogue demon dragon, as she was the hunting heroes. She was thrown in 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 learnt 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. Kizuna failed miserably to convince them. She held many meeting as possible to gain them on her side but couldn't succeed. She finally understood the hardships face by Nafoumi in his summoned world.

Naofumi Iwatani
Kizuna met Nafoumi 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 Nafoumi held his suspicion on her. They exchanged their stories and come to a better terms. Nafoumi helped her to escape the labyrinth and unite with her friends. She was amazed by his business and negotiating skills.

She was stressed by Nafoumi's untrusting nature and asked him to have little faith in others. Both accept to work together in saving both the worlds together and parted in better terms.