Her solo concert “TRUE Live Sound! vol.4 ~Progress~” was originally scheduled to be held at Hihon Seinenkan in Tokyo on the day, but it has been postponed to January 17, 2021, at Nakano Sunplaza Hall in Tokyo, due to the ongoing COVID-19 outbreak.
Karasawa started her singing activities under her new artist name TRUE by releasing “UNISONIA” in February 2014.
To celebrate its fifth anniversary, the concert featuring the single songs released after 2014 was held at TSUTAYA O-EAST in Tokyo on February 10, 2019.