Yasashi was born and grew up Jakarta, and started her singing journey as singer and vocal coach at church, supported by her perfect pitch ability. After she got her bachelor degree from Public Health Faculty at University of Indonesia, she continued her study and finished a 2-year voice program at Royal College of Music, fully funded by the government. As for now, she actively gives workshops and vocal trainings to churches and institutions, and also being jury, such as Pesparawi Nasional (2022) and choir festival held by OJK (2023).