Atsushi Nakajima/Relationships

Orphanage Director
Atsushi always hated the orphanage director due to him torturing him verbally and mentally.

Osamu Dazai
Atushi first meets Dazai when he rescued him from drowning in the nearby river. He is also the one who recommended Atsushi to become an agency member. As Atsushi's superior, he advises Atsushi not to pity himself or it will be an endless nightmare when the orphanage director who tortured him died.

Doppo Kunikida
Atsushi

Ranpo Edogawa
Being new to the agency Atsushi often wonders about Ranpo's words and actions. He was even surprised that Ranpo does not know anything including how to buy a ticket or which platform to go into and concludes that he cannot o anything without his ability. However, this thought of Atsushi was changed when he founds out that Ranpo does not have the ability and is not actually gifted. He then realizes why everyone in the agency trusts Ranpo so much.

He also respects and obeys Ranpo as to letting him ride on his back for a ride.

Kenji Miyazawa
Atsushi is partnered with Kenji when they have investigated a car explosion incident. Though he thinks that sometimes Kenji's methods of investigating is unique, he later then dismisses it and follows his lead. Due to naiveness and how simplistic Atsushi is, he may find Kenji's methods to be a standard. As Kunikida states, they are the best and worst team together.

Kyōka Izumi
Atsushi first encounters Kyoka when he assisted Yosano in shopping. He later founds out Kyoka has killed 35 people and wants to stop killing others, he then saves her from the bomb explosion. As someone who understands what she has gone through, Atsushi deeply cares about Kyoka as to accompanying her when they explored Yokohama. He also tries to protect when someone tries to hurt her.

Jun'ichirō Tanizaki
Though Atsushi and Tanizaki are of the same age, Atsushi calls him Tanizaki-san.