[1] Moving up in recognition and the level of his competition, he scored an upset sixth round knockout against Japanese boxer Katsuyoshi Takayama on November 6, 1967, in Okayama, Japan.
[4] On May 15, 1968, he fought a twelve round draw for the Oriental and Pacific Boxing Federation (OPBF) Flyweight Championship against Tsuyoshi Nakamura in Tokyo, Japan.
Chionoi immediately announced his retirement after the win, his fourth title defense, stating, "I am tired of the fightgame and feel sick and unwell.
He took the WBA World Flyweight Championship in a fifteen round unanimous decision on October 19, 1969 against Japanese boxer Hiroyuki Ebihara at the Prefectural Gymnasium, in Osaka, Japan.
[1] While still champion on December 14, 1969 he was defeated in a non-title fight by Masao Oba in a ten round unanimous decision in Tokyo, Japan.
[7] In his first title defense, he lost the WBA World Flyweight Championship in a close fifteen round split decision on April 5, 1970 against Thai boxer Berkrerk Chartvanchai in Bangkok, Thailand.
[1] On June 24, 1977, he won the Philippines Games and Amusement Board's (GAB) Flyweight Title by defeating Arnel Arrozal in a fourth round technical knockout in Manila.
[1] On March 7, 1978 he won a fourth round knockout in an important bout against 1980 World Light Flyweight Champion Shigeo Nakajima in Tokyo, Japan.