Naoya Nifuji is Hirotaka Nifuji's 19-year-old younger brother, separated by seven years. A university student, he works part-time as a barista in a coffee shop next to his brother's office building. He has light golden-brown dyed hair (natural blue, like Hirotaka's), dark blue eyes, and stands 177 centimeters tall. Born on April 21st with blood type AB, Naoya possesses a cheerful, sociable personality often noted for its distinctive cat-like smile. He genuinely enjoys his barista work and pleasing customers. Unlike his brother and most peers, he is not an otaku, unfamiliar with otaku slang and internet subcultures, and notably unskilled at video games. Naoya deeply cares for his introverted older brother, consistently worrying about Hirotaka's well-being and celebrating his successes. He shares a close, sibling-like bond with Narumi Momose, who views him as a younger brother; she is protective of him, evidenced by her anger when believing someone made him cry. His significant development stems from his relationship with Kō Sakuragi, a socially anxious, avid gamer classmate. They first meet at his café where he observes her gaming instead of studying. After returning information she left behind at their university, a misunderstanding occurs when Naoya expresses a desire to be friends, which Kō interprets as an in-game request. Despite this, they form a real friendship centered on gaming and arcade visits. Naoya's feelings for Kō evolve beyond friendship. He misinterprets her statement about liking him and wanting to be friends forever as romantic, leading to disappointment. Later, when Kō starts a part-time job and frequently declines his invitations (often falsely citing work), Naoya becomes distressed, seeks advice from Hirotaka (crying over the situation) and friends, and eventually confesses his romantic feelings, which Kō happily accepts, starting their relationship. Future developments indicate their relationship deepens. The author notes Naoya plans to propose by defeating her in a video game, though Kō remains unaware and continues to win consistently. Illustrations show Naoya persistently challenging her with a smile, and Kō affectionately calls him "Nao-chan," signaling their ongoing closeness.