|Nickname||Argos-2 (アルゴス２, Arugosu Tsū) (by Argos Team)|
|Group||3 Idiots of D-Class|
|Affiliation||Advanced Nurturing High School|
|Private Point||777 (history)|
|Light Novel||Volume 1|
|Manga||Volume 1, Room 3|
Yamauchi is a young man of average height with has brown hair and red eyes. He is often seen wearing the standard school uniform.
According to the interviewer who assessed him during the entrance examination, Haruki has a tendency to lie.
Similar to his friends, Haruki has a perverted side and is attracted to Kikyō Kushida, as he was willing to peep on the girls. He is also attracted to Airi Sakura, mainly for her well-endowed body and for her sweet nature.
During the island test, while he was picking up branches, he told Kiyotaka Ayanokōji that, he was going after Airi, because of Kikyō being out of his league, and claimed that Airi would fall for him if he began behaving nicely.
Academic Abilities Edit
In Volume 10, Yamauchi was expelled after getting the lowest combined amount of votes in the class after the special exam ended, without having 20 million points needed to save himself. Therefore, he became the very first student of his class to receive expulsion from the school.
- Yamauchi has a tendency to lie.
- During his introductions in the light novels, he first lied not only about being a table tennis player who reached the national level, but also being baseball club's ace in middle school whose uniform number is 4. According to him, since he got an injury during the inter-high games recently, he is "currently" in rehab.
- He shares the same student identification number with Kōhei Katsuragi.
|Homeroom Teacher||Sae Chabashira|
|Class Representatives||Suzune Horikita • Yōsuke Hirata|
|Students||Kiyotaka Ayanokōji • Kikyō Kushida • Airi Sakura • Kei Karuizawa • Rokusuke Kōenji • Ken Sudō • Kanji Ike • Haruki Yamauchi • Teruhiko Yukimura • Akito Miyake • Haruka Hasebe • Mei-Yu Wang • Kokoro Inogashira • Maya Satō • Hideo Sotomura • Chiaki Matsushita • Satsuki Shinohara • Kayano Onodera • Nene Mori • Wataru Ijūin • Ryōtarō Hondō • Soshi Miyamoto • Kyosuke Okiya|
|Ken Sudō • Kanji Ike • Haruki Yamauchi|