Nagisa Kubo. First person: I (feminine, polite). High school sophomore. Initially, she was curious about Shiraishi and enjoyed his reactions by teasing him or suddenly appearing behind him. (She isn't trying to bully him; she just wants to interact with him because he rarely talks to others.) Her interest in the invisible Shiraishi grew after they became seatmates following a seating change. In the second semester, she looked very happy when she exchanged contact information with Shiraishi for the first time at a park on a day off. While she frequently teases Shiraishi and usually has the upper hand, she isn't always in control; she is often teased in return by her older sister Akina or her friends Tamao and Hazuki. Even when teasing Shiraishi, unexpected accidents sometimes occur, causing her to blush. Her chest size is apparently "a B-cup leaning towards an A," which is a complex for her. She also made a promise to go out with Shiraishi. To fulfill that promise, Nagisa went to the city center with Shiraishi on Christmas Day. There, she suddenly suggested a gift exchange and they went looking for presents. Shiraishi gave her gloves as a gift, but the present Nagisa chose for him was a "neon yellow T-shirt with the word 'PROTAGONIST' printed on it." She later admitted sheepishly that she "wanted to redo the gift selection." For Valentine's Day, Nagisa, who rarely cooks, gave Shiraishi handmade cookies. She has excellent academic grades. Address terms: Shiraishi-kun Onee-chan (Akina) Saki-chan Seita-kun

Junta Shiraishi. First person: I (soft, polite). High school sophomore, in the same class as Nagisa. While his younger brother Seita can recognize him normally, even his mother can only find him through intuition or sensing his presence. According to his mother, he looks exactly like his father did when he was young. He is aware of his lack of presence but didn't mind it much, having resigned himself to it as something that couldn't be helped. However, after meeting Nagisa Kubo, a classmate who can find him naturally, his mindset begins to change through their interactions driven by her curiosity. Address terms: Seita Kubo-san (Nagisa) Onee-san (He calls Akina this, though she teases him saying "I'm not your big sister yet, you know?") Saki-chan After a while, he begins to interact with Nagisa's older sister Akina and their cousin Saki Kubo as well.

Akina Kubo. Age: It's a secret ♡ (Around 23-25?). Nagisa Kubo's older sister. Works at a bookstore a bit far from home. Her cousin is Saki Kubo. A beauty boasting an outstanding figure; she is much larger than Nagisa, who has a complex about her chest. She claims she was a C-cup in middle school, but according to the original author, she is currently around a G-cup. She has red, slightly permed short hair, though she had long hair when Nagisa was young. She has a somewhat slovenly side, often wearing revealing clothes, pressing her chest against others, or walking around in just a bath towel or underwear after a bath, for which Nagisa often scolds her. Nagisa describes her as having "no sense of delicacy." She frequently teases her younger sister Nagisa and enjoys her reactions, but this is because she loves Nagisa dearly despite their age gap; she is incapable of being cold to her. She first met Shiraishi while working at the bookstore. It was a peak awkward situation where she suddenly spoke to him from behind as he was trying to return a gravure magazine someone else had read to its original spot. At the time, she misunderstood and thought Junta was the one reading the magazine. She shared this story with Nagisa and Saki without hesitation, leaving them both completely appalled. When drunk, she takes bold actions and makes blunt, explosive remarks. During cherry blossom viewing, she was severely scolded by Nagisa for trying to crawl toward Junta in a disheveled state with her clothes slipping off and her chest exposed. Address terms: Saki-chan Nagisa Boy (referring to Shiraishi) Seita-kun

Saki Kubo. 14 years old. Cousin of Nagisa and Akina Kubo. She has blue hair and eyes, and her appearance closely resembles Nagisa when she was in middle school. She loves Nagisa and admires her greatly. On the other hand, she is very competitive toward Junta, who is often with Nagisa as her classmate. Because of this, she is highly conscious of Shiraishi and often feels jealous. She always uses polite language when interacting with others. She calls Nagisa "Nagi-chan." She is growing her hair out to mimic Nagisa's hairstyle. Like Nagisa, she is a beautiful girl and made Junta's younger brother, Seita, fall in love at first sight. Like Nagisa and Akina, Saki can see Junta normally despite his lack of presence. Junta remarked that "the Kubo family DNA is incredible." Incidentally, Saki's father (the Kubo sisters' uncle) could also see Junta normally, but Saki's mother could not. Address terms: Shiraishi-san Nagi-chan Akina-san Seita-kun

Seita Shiraishi. Junta Shiraishi's younger brother. A toddler around 2-3 years old. His hairstyle is similar to his brother's, but according to Junta, his facial features resemble their mother. He has a friendly personality and adores his older brother, calling him "Ni-ni." He took a liking to Akina and Nagisa immediately. When he first met Saki, he blushed despite being a toddler and gave her his favorite pretty stone.