Happosai Intro Arc

The  is the 13th story arc covered in the Ranma ½ manga, spanning seven chapters. This arc was included in volume 7 of the  and volume 6 of the Viz Media tankōbon.

Plot Summary
Having escaped from his tomb in the, Happosai, the founder of Anything Goes Martial Arts, heads to Furinkan in order to relocate his disciples, Soun and Genma. Once he arrives Happosai meets Akane and Ranma who takes them to their fathers. Afterwards, Happosai is informed about Ranma's curse and so decides to use any opportunity he gets to turn Ranma into his female form for his won perverted enjoyment.

Now that he's living within close proximity to Furinkan High School, Happosai begins making regular raids on the female locker rooms so that he can steal the students' underwear. Knowing how strong the old lecher is, and tiring of his perverted antics Ranma devises a plan involving Akane stitching a special Woman Repellant powder which will stop Happosai getting anywhere near women.

Although Ranma's plan initially works a suddenly rain storm manages to help Happosai in getting close enough to Ranma's female from so that he can recover to full strength. Seeing how much their children are struggling against their evil master, Soun and Genma intervene. However, after Soun is quickly dispatched by Happosai's Battle Aura, Genma begins projecting his battle aura against Happosai's creating gigantic copies of themselves until they both tire out.

Major Events

 * Soun and Genma's master, Happosai, returns.
 * Happosai starts living at the Tendo Dojo so that he can go on panty raids at Furinkan High.

Major changes in anime

 * Shampoo and her grandma make a short cameo, during which Cologne warns Ranma how dangerous Happosai is.
 * Chapter 65 (public bathhouse) is generally much extended, while chapter 66 (sleeping with P-Chan) was skipped.
 * Women Repellent was from Shampoo instead of herbalist in China.
 * Ranma doesn't use pictures to distract Happosai, just his own body.
 * Soun doesn't wear the armor for the battle.

Characters Introduced

 * Happosai
 * Man From Neighborhood Watch