|Nickname||Argos-2 (アルゴス２, Arugosu Tsū) (by Argos Team)|
|Class||1-D (1st Year)|
|Group||3 Idiots of D-Class|
|Affiliation||Advanced Nurturing High School (formerly)|
|Light Novel||Volume 1|
|Manga||Volume 1, Room 3|
Haruki 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 very attracted to Airi Sakura and Haruka Hasebe, mainly for their well-endowed bodies and quiet 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.
Despite his negative traits, he was, although rarely, able to act maturely as shown after being rejected in volume 4.5.
Academic Abilities Edit
In volume 4.5, Haruki made a confession to Airi Sakura but was rejected. Accepting the answer, he told Kiyotaka that he was just troubling her and learned that conveying your feelings also carries a responsibility to it. He also noted that his feelings for Airi were just shallow and he didn't really like her from the bottom of his heart. After that, Haruki claimed he was graduating from this random love and would find a girl he could really come to like.
In Volume 10, he got more than half the class's support to vote against Kiyotaka in the special exam, Class Poll, under instructions from Arisu Sakayanagi of Class A. However, unbeknownst to him, Arisu gave her class's praise votes to Kiyotaka instead so she could have her revenge on him after their encounter in volume 8. His actions also got exposed and after getting the lowest combined amount of votes in the class without having 20 million points needed to save himself, Haruki became the very first student of his class to receive expulsion from the school.
- Since D-Class is for those with defective traits, Haruki‘s defect is that he has a tendency to lie.
- During his introductions in the light novels, he first lied not only about being a table tennis player who had 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 • Kyōsuke Okiya|
|Ken Sudō • Kanji Ike • Haruki Yamauchi|