In March, a court in the central city of Nagoya acquitted the man of raping his daughter, 19, despite years of sexual abuse.
The court recognised that the woman had sex with her father against her will in August and September of 2017 but ruled she could have resisted if she wanted to.
Protesters gather at the rally called 'Flower Demo' to criticize recent acquittals in court cases of alleged rape in Japan.
Holding flowers and placards with slogans such as '#MeToo, #WithYou', sexual abuse survivors recounted their experiences at the rally.
Prosecutors argued that repeated violence and threats leveled against the daughter meant she was unable to resist her father.
They were protesting against several rape acquittals, including a case where a father was cleared of raping his daughter.
The father was cleared of the rape, despite the court admitting that the sex was against his daughter's will. »