Mezue ahịrịokwu na-esonụ: bụ onye na-egwu mmiri na Japan. Ọ gbara asọmpi na
asọmpi ụmụnwaanyị na-efe efe mita 200 n'egwuregwu Olimpik nke 2016. N'ọnwa Eprel 2017, Hasegawa mebiri ndekọ ụwa nke ndị na-eto eto na 200 butterfly na 2:06.29 na Japanese Nationals. Ọ tozuru oke ịnọchite anya Japan na 2020 Summer Olympics.