Happy!

Happy! is a Japanese sports manga series written and illustrated by Naoki Urasawa. It was serialized in Big Comic Spirits from 1993 until 1999, with its 254 chapters collected into 23 tankōbon volumes by Shogakukan. The story follows a teenage heroine who embarks on a career as a professional tennis player to repay an enormous debt incurred by her brother to yakuza loan sharks, with the threat that if she fails, they will force her into a life of prostitution at a soapland.