I believe you're referring to "Kegareboshi"!

While Kegareboshi received positive reviews for its unique premise and exploration of social issues, it also faced criticism for its handling of certain themes and character portrayals.

The anime explores themes of identity, social norms, and acceptance, delving into the complexities of a world where traditional notions of sexuality are reversed.

The story takes place in a world where homosexuality is the norm, and heterosexuality is seen as a genetic abnormality known as "Kegare" (stigma). The main character, Kazuya Fuyou, is a young man who possesses the rare "normal" gene and becomes the target of attention and desire from those who are attracted to him.

The animation style of Kegareboshi is notable for its blend of traditional and digital techniques, with vibrant colors and detailed character designs. The series features a mix of action, drama, romance, and comedy elements, making it a thought-provoking and engaging watch.

Kegareboshi, also known as "Stigma" or "" in Japanese, is a Japanese anime television series created by Kazuya Minekura. The series premiered in 2004 and consists of 26 episodes.

What specific aspects of Kegareboshi's animation would you like to discuss? The character designs, the world-building, or something else?