Tsubasa Kurenai Busts Loose! (突撃！紅つばさ Totsugeki! Kurenai Tsubasa?) is the 100th chapter of the manga and the first chapter of the Tsubasa Kurenai Arc. Ranma recieves a letter from someone named Tsubasa Kurenai who want to challenge him. Ranma has never heard of Tsubasa and is surprised to come across a mailbox that tries to attack him. Once the mailbox has been dealt with Ranma finds out that there is a young girl inside that is looking for Ukyo.