|Full Name||Nakamaru Kousaku|
|Manga Debut||Chapter 81|
|Anime Debut||Episode 16|
Kousaku Nakamaru (中丸 工作, なかまる こうさく lit. Nakamaru Kousaku) is a rookie electronics clerk who has been training for 4 months. He has a scheming personality and persistently watches over Kusuo, following him wherever he goes to persuade him into buying an expensive TV. However, it would seem that even Kusuo would lose to him despite being a psychic. Nakamaru's four months of training didn't go to waste as he was able to make Kusuo buy an expensive coffee jelly maker instead of a TV.
- Nakamaru Kousaku's full name and character profile was found in the character guidebook.