Due to the side effects of medication, she developed cramps in her right leg with paralysis in her right foot, as well as a weakened right hand.

In September 2016, Ohtani took part in the Osaka Open, an ITF3 wheelchair tournament, where she immediately reached the final.

[3] In 2018, Ohtani won the bronze medal in the women's singles at the Asian Para Games in Jakarta.

A month later, at Roland Garros, she reached the singles final by beating Kgothatso Montjane and then world number one, Diede de Groot; she lost the final match to her compatriot Yui Kamiji.

At the 2020 Summer Paralympics, Ohtani won the bronze medal in doubles alongside Kamiji.