Top 9 in Top 10 best Gender Bender anime not to be missed.
Back Street Girls: Gokudolls - Trailer
The content of the story revolves around a group of 3 brash yakuza guys who have failed their assigned mission. So the boss gave the 3 guys 2 options: 1 is to commit suicide by septum surgery, 2 is to go to Thailand to undergo gender reassignment surgery to become 3 girls and form an idol group. After a year of undergoing many surgeries, treatments and training, all 3 were able to appear in public for the first time. Unexpectedly, they were so popular because of their lovely appearance, all the troubles started from there.