She was motivated by her siblings to start playing volleyball and her brother would always give good advice about spiking when she was in high school.

[4] She started playing volleyball when she was in the third year of Yahagi Minami Elementary School, in Okazaki city, and joined the local club team Anjo Kita Rabbits.

[16] In July 2019, at 2019 FIVB Volleyball Women's U20 World Championship in Mexico, Mayu served as the captain of the under-20 national team.

[20] In the August of the same year, Japan won the gold medal at the 2019 Asian Women's Volleyball Championship and Mayu received the same awards at the end of the competition.

[21] Her success was evaluated by Kumi Nakada, the director of the Japan senior national team, so she became a member of the 2019 FIVB Volleyball Women's World Cup Japanese roster.

[22] In the tournament, she was appointed as a starting member in the matches against United States and South Korea, and was the best Japanese scorer in both games.