Tuxedo Gin(1997)

Tuxedo Gin

Meet seventeen-year-old Ginji Kusanagi. Things are going great for him; he's only in high school but he's on the eve of making his debut as a pro-boxer. He's also just met Minako Sasebo, the girl of his dreams. Unfortunately, Ginji has an accident and dies...and is then reincarnated into a penguin! Will love be able to bloom between a boxing penguin and a beautiful girl!?

(Source: Viz Media)