Yamato is one of Hayato's friends. He is in the rugby club.

This romantic comedy revolves around an antisocial high school student named Hikigaya Hachiman with a distorted view on life and no friends or girlfriend. When he sees his classmates talking excitedly about living their adolescent lives, he mutters: "They're a bunch of liars." When he is asked about his future dreams, he responds: "Not working." A teacher gets Hachiman to join the 'Volunteer Service' club, which happens to have the school's prettiest girl: Yukinoshita Yukino. 
(Source: Anime News Network)


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__Non-Anime Roles:__

- Ovis Gideaux - Metaphor: ReFantazio (VG)

Hikigaya Hachiman is a high school boy with twisted character. He prefers to go against the trend and refuses to make friends with anybody. In order to get Hachiman back the right track, his school teacher Hiratsuka Shizuka forces him to enter 'Public Service Club'. There he meets other problematic students. 
Includes volumes 6.5, 7.5, 10.5, and 14.5.

Hikigaya Hachiman is a high school boy with twisted character. He prefers to go against the trend and refuses to make friends with anybody. In order to get Hachiman back the right track, his school teacher Hiratsuka Shizuka forces him to enter 'Public Service Club'. There he meets other problematic students.


The second season of Yahari Ore no Seishun Love Come wa Machigatteiru. 
 
Yahari Ore no Seishun Love Comedy wa Machigatteiru. Zoku picks up immediately after the events of the first season, continuing the adventures of the Volunteer Service Club—the dispassionate Hachiman Hikigaya, the cheerful Yui Yuigahama, and the competitive Yukino Yukinoshita—as it dedicates itself to helping any student with issues that they may face. 
 
With the rift among his own group widening, Hachiman begins to realize that his knack for quickly getting to the root of other people's troubles is a double-edged sword: sometimes the best solution is not necessarily the most appropriate one. 
 
(Source: MAL Rewrite)

Hachiman Hikigaya is a cynic. He believes "youth" is a crock-a sucker's game, an illusion woven from failure and hypocrisy. Unsurprisingly, he's not the most popular guy. Meanwhile, there's Yukino Yukinoshita-brilliant, beautiful, and chillier than winter in Antarctica. Would you believe she's not exactly beloved by her classmates either? The unlikely pair gets forced into a club dedicated to helping solve their fellow students' problems. But will an ice queen and a screwup really be able to help anybody?
 
(Source: Yen Press)