"Pae", a strict Thai monk, is contacted by a sister "Aom" that she is getting married and wants Luang Phi Pae to attend her wedding in Japan. Luang Phi Pae's go Japan with his sidekicks. When they arrive in Japan, "Chin", a Japanese monk come to pick up Luang Phi Pae and during the journey to the sister's resident, they encountered a group of Yakuza. After that Luang Phi Pae knows Chin is the one who gonna marry with his sister and known that Chin used to be a Yakuza before. Luang Phi Pae thinks that Chin must have deceived his sister. Chin tries to explain that he had stopped being involved with the Yakuza but Luang Phi Pae still doesn't believe him and tries many ways to prevent Chin from marrying. So, Chin need to prove and shown that he really sincere with Aom.