After waking up, he traveled to a dangerous world where alien beasts were rampant. Before Tetsuya Kamiya had time to plan his future, he was accidentally selected by the light during a monster attack and became the human body of Ultraman Nexus. However, becoming a giant of light is not as beautiful as imagined. The unfamiliar power, severe pain, and prying eyes from the mysterious organization all made him physically and mentally exhausted. He is not a born hero, just an ordinary person who wants to live. In order to protect his daily life and understand everything that happened to him, Tetsuya Kamiya must learn to struggle to survive between humans and giants, and face the endless darkness lurking in deep space and the hearts of people.