TV-Series
Description
Naoyuki Andō is a high school student who serves as a supporting character in the narrative. He is the childhood friend of Hiro Shishigami, and the only person outside of Hiro's family that Hiro trusts and opens up to. Andō has a gentle and overly kind personality, which made him a target for bullying by his classmates. As a result of this persistent harassment, he became a shut-in and withdrew from attending school. His nickname, Chokko, is derived from the on'yomi reading of his given name.

Andō's motivations are rooted in a strong sense of justice and moral responsibility. Initially, he is the first person to learn about the mechanical bodies that both Hiro Shishigami and Ichirō Inuyashiki have acquired. He is initially amazed by Hiro's powers, but when he discovers that Hiro is using those abilities to commit serial murder, he is horrified and feels a deep sense of guilt and responsibility. The conflict between his loyalty to his childhood friend and his ethical convictions drives him to act.

His role in the story is that of a liaison and strategist. As an ordinary human without any superhuman abilities himself, Andō represents the perspective of the common person caught in extraordinary circumstances. He secretly teams up with Ichirō Inuyashiki, becoming his informant and assistant. Andō uses his knowledge of technology and his familiarity with science fiction to help Inuyashiki understand and control his new mechanical body. He also provides tactical support and helps track Hiro's movements, serving as a technical mentor and advisor to Inuyashiki in their shared mission to stop Hiro's rampage.

Andō's key relationships are defined by contrasts. With Hiro Shishigami, he shares a deep history as close friends since childhood. Hiro had previously protected Andō from bullies, and Hiro was the one who encouraged him to return to school after revealing his powers. However, once Andō learns of Hiro's murders, he distances himself and eventually opposes him, cutting ties due to the irreconcilable difference in their values. With Ichirō Inuyashiki, Andō forms a strong partnership based on mutual respect. He views Inuyashiki as a true hero and comes to support his mission wholeheartedly. Andō also interacts with other characters such as Mari Inuyashiki and Shion Watanabe, though these relationships are more peripheral and tied to the central conflict.

Throughout the story, Andō undergoes significant development. He evolves from a reclusive, bullied teenager who avoids conflict into a brave and proactive collaborator who risks his safety to help stop a deadly threat. He learns to grapple with the loss of his friendship with Hiro and finds a new sense of purpose in assisting Inuyashiki, ultimately playing a vital role in the effort to end Hiro's reign of terror. His arc is one of moral awakening and growth, as he transitions from passive victim to active agent for good.

Andō possesses no superhuman abilities. His notable skills lie in his intelligence, his adeptness with information technology and electronic devices, and his tactical thinking. He uses computers and IT equipment to track Hiro's location and to coordinate with Inuyashiki. His value stems from his analytical mind and his ability to strategize, making him an effective commander and planner despite his lack of physical power.