Family[]
Takeru Sengoku[]
Kakeru is in many ways similar to Takeru and has a cordial relationship. Neither of them is very expressive about their emotions, and both are pretty quiet, so they don't talk much. However, they both play the online game and often chat with each other in it. Kakeru has kept the fact that he is dating Ayasaki a secret from his parents, only revealing it after they graduated. It was also Takeru who taught Kakeru, from a very young age, to be wary of Hori's family.
Kozue Sengoku[]
Kozue is rather forceful towards Kakeru, oftentimes lying or ordering him to do things he doesn't want to do, like let her cut his hair or take his picture. Also, to maintain her dignity as his mother, Kozue hides her delinquent past from him. Kakeru and Kozue's voices sound almost identical, and even their own family can't usually tell them apart.
Shizuru Sengoku[]
Shizuru is Kakeru's daughter through Remi Ayasaki.
Romance[]
Remi Ayasaki[]
Although seemingly opposites, their mutual interest in books drew them together. They began dating as freshmen and their relationship has continued ever since where they are deeply in love. Sengoku will go to great lengths to protect Ayasaki, generally from the advances of Shin Yasuda. Sengoku and Ayasaki will sometimes get into fights over trivial things, such as how cool a certain bug is or which kind of food is better. However, they usually make up pretty quickly. Sengoku is also terrified of Ayasaki's bug collection and never goes over to her house.
In the webcomic ending, they get married (which now makes her Remi Sengoku), and he becomes the father of Shizuru Sengoku.
Friends[]
Sakura Kouno[]
Sengoku is very good friends with Kouno. Whenever Sengoku and Remi Ayasaki fight, Kouno usually helps reconcile the couple. Sengoku also thinks of Kouno as very reliable, and, along with Ayasaki, is one of the few people he calls by their first name. In contrast to Kouno's worrying about dieting, Sengoku wants to gain weight and usually reacts poorly any time Kouno talks about it.
Sengoku is frequently seen together with Kouno and Ayasaki.
Kyouko Hori[]
Sengoku and Hori are childhood friends, due to the friendship between their parents. As a result of Sengoku's cowardice, along with Hori's aggressiveness, Hori tended to push around Sengoku. They were almost always together during elementary and junior high school, to the point where most people thought they were dating, although both of them vehemently denied this. When choosing high schools, Sengoku specially chose Katagiri, thinking that Hori was going to attend Yasaka and that he could finally be free of her. He was mistaken.
In high school, they continued to be friends. However, the bullying aspect of their relationship mostly disappeared, as they dated other people and weren't together as much. However, since their group of friends is the same, they're often together and act normally toward each other. However, if the 2 of them are left alone, or interacting in a 1-on-1 manner, Sengoku will return to being afraid of Hori.
Izumi Miyamura[]
Due to Miyamura's airheaded personality, he tends to be very clingy to Sengoku, which in turn irritates Sengoku. Fortunately, Miyamura is unaffected by his irritation, and Sengoku doesn't really hate it, so both are fine with continuing it. Sengoku is generally more lenient with Miyamura and is slower to anger him. They also share a commonality in their weight, and sometimes have contests about which one is heavier (Miyamura usually wins). Sengoku is also very puzzled about why Miyamura hides his body (he does not know about Miyamura's tattoos), and has tried various techniques to find out. At the start of the story, it can be seen a few times that he is still a little afraid of Miyamura because of that one time when he aggressively headbutted him. This minor is no longer seen later in the story, possibly stating that he no longer considers Miyamura to be a threat to him like Kyouko Hori and considers Miyamura to be a friend.
Shuu Iura[]
Due to their different personalities, Sengoku and Iura are generally at odds with one another. Iura's loudness annoys Sengoku, and Sengoku is quickest to anger when Iura's involved. To counteract this, Iura often uses Yanagi as a middleman for his jokes and pranks, knowing that Sengoku won't get angry at him. Despite all this, Sengoku still considers Iura a friend, even though he would never openly say it to him.
Akane Yanagi[]
Sengoku wants to be closer to Yanagi. However, due to his lack of expressiveness about his emotions/friendships, along with the way Yanagi feels distant, this has been a slow process.
Tooru Ishikawa[]
Sengoku sees Ishikawa as the reliable one in the group. He also usually relies on him to keep Shuu Iura under control. However, even Ishikawa is not free from Sengoku's irritability and is even extremely hostile towards him when he thinks Ishikawa is molesting Akane Yanagi. All in all, Ishikawa is probably the one who Sengoku could call a friend the easiest.