He has assumed (without basis) that Kei would not marry him if he had the tattoos in The Sea Smells of Romance. Kei sent Black Jack a letter about a young sailor who wants to have his enormous back tattoos removed, because he discovered Kei was biologically a woman, and wanted to marry him (as a woman). However, it's shown years after the surgery that they remain good friends, if not more. He was Megumi, and Black Jack's girlfriend before he had surgery due to having ovarian cancer which forced Black Jack to remove his entire female reproductive system, and believing that he was no longer a woman, blocked out the former feelings he had for Black Jack. He also seemed to treat Pinoko very well when they first met, and although he did reprimand her, he seems to be responsible as well. Whenever he sees Black Jack he always has a beaming smile, and he is quite expressive. He appears to be a kind person who respects Black Jack as a friend but wishes to forget about his past as a woman, having chosen to become a ship's doctor because it was a man's job.
