 Hasegawa auditioned for AKB48's then-upcoming Niigata-based sister group, NGT48, on July 25, 2015, having been fascinated with the group after watching "AKB0048".She was accepted as a kenkyūsei (trainee), and on January 10, 2016, during the grand opening of NGT48's theater, she debuted as a full-time member with 15 other girls to the group's newly established Team N3.NGT48 later made their major label debut on April 12, 2017, with the single "Seishun Dokei."