ONE PIECE VOL 6

Luffy thought that Sanji was a very good person, so he asked Sanji to join him, but Sanji Refused.
Two days later, Ging came back with his Captain, Don Krieg. Sanji gives them some food. When Don Krieg got his strength back, he demanded that the Baratie become his ship, because his ship was destroyed by someone in Grand Line.
Sef used to be a very famous pirate, Sef the Red Leg Pirate, because of his powerful kick. But Sef has lost one of his legs. However, Sef traveled in Grand Line for a year, so Sef understood that Don Krieg and his crews escaped from Grand Line.
Ging told everyone that all 50 of their ships were destroyed by one man. He was Mihawk, the Hawk Eyes Pirate, one of the seven “gods of pirates”. When Zoro heard about this, he got excited because Mihawk is the greatest swordsman in the world. If he can defeat Mihawk, Zoro will become an invincible swordsman. While they were talking, Mihawk finally arrived and determined to destroy Don Krieg and his crew because he has nothing to do. Krieg's pirates were very panicked!
Before Mihawk started to slaughter Don Krieg's pirates, Zoro challenged him to a fight. Mihawk defeated Zoro with a small knife. Zoro lost and was seriously injured!! However, Mihawk respected Zoro's spirit, so he did not kill Zoro. He told Zoro to become stronger to come challenge him again in the future. Then, Mihawk left the restaurant without killing anyone.
While everyone is busy, Nami has escaped with all the treasure and the ship. So Usop, Yosaku, Joni, and Zoro followed her.
Luffy stayed in the restaurant because he really wanted Sanji to go with him. After Mihawk left, Don Krieg began his fight to conquer the restaurant ship. Sanji fight back by using his leg! It seems that Sef has taught Sanji his kicking techniques.