Samurai Harem: Asu no Yoichi

Samurai Harem: Asu no Yoichi (明日のよいち! Asu no Yoichi!, lit. Tomorrow's Yoichi) is a Japanese manga series written and illustrated by Yū Minamoto. It has been serialized in Monthly Shōnen Champion since October 2006 with last volume released on March 8, 2011. It has been adapted into an anime series by AIC and was broadcast in Japan on TBS between January 8, 2009 and March 26, 2009.

Amazing Without Clothes (Episode 3)
Tsubasa Tsubame, a clumsy and shy girl, transfers into Ibuki and Yoichi's class. Tsubasa secretly knows martial arts as she trained together with Angela Takatsukasa. When Angela strips Tsubasa's clothes off in front of Ibuki and Yoichi, Angela exploited Tsubasa's shyness to transform her to fight with Yoichi.