Both Kazuichi and Mikan rarely interact with each other in canon, so not much is known about their relationship. Although at the very least, neither character appears to dislike the other.
Both are sensitive, and often worry about how they are perceived by others. This makes them easy targers of Hiyoko Saionji and her relentless teasing, as they appear to let it bother them the most.
Kazuichi is shown to have faith in Mikan's nursing abilities. In Chapter 2, when Akane Owari enters the diner with a severe head wound, Mikan quickly rushes her into the bathroom for treatment. Kazuichi then remarks that everything will be fine as long as they leave it to the Ultimate Nurse. Later on in the same chapter, Kazuichi can be seen frantically begging Mikan to try and fix a severely wounded Fuyuhiko Kuzuryu.
In episode 3 of Despair Arc, there's a brief scene where Kazuichi gets bitten by one of Gundham Tanaka's hamsters, and Mikan rushes over to see if he's okay.
The ship isn't very popular, as there are far more popular shipping choices for both characters. Those who do support the ship believe that both characters would be able to help each other with their social insecurities, as well as be able to stand up to Hiyoko whenever she tries to bully them.
- Both characters are blood type A.
- For whatever reason, Kazuichi is not featured on Mikan's relationship chart in the official artbook.