Sasaki, who was the chief creative director for this year’s Games opening and closing ceremonies, said he told a planning group through a group chat that Naomi Watanabe could play a “Olympig” role.
“There was a very inappropriate expression in my ideas and comments,” said Sasaki in a statement released by the Games’ organizers at dawn on Thursday. “I sincerely apologize to her and to the people who were uncomfortable with such content.”
Hashimoto and Tokyo 2020 CEO Toshiro Muto plan to address the issue at a news conference on Thursday, organizers said.
Sasaki’s resignation came quickly after the weekly magazine Shukan Bunshun published his statements on Wednesday.
Mori, 83, a former prime minister, was replaced by the athlete who became politician Hashimoto, who promised to make gender equality a priority at the Games.
The Olympics are scheduled from 23 July to 8 August and the Paralympics from 24 August to 5 September.