[4] After passing the audition for the group's first generation on July 25, 2015,[5] at the opening show of NGT48's theater on January 10, 2016, she debuted as a regular member of the newly established Team NIII.

[6] As part of NGT48, she subsequently made her major label debut on April 12, 2017, with the single "Seishun Dokei.

In 2019, after Team G co-captain Yamaguchi Maho was forced by the NGT48 management to apologize for publicly alleging that she was assaulted in December 2018, Hasegawa removed "NGT48" off her social media profiles to show support.

[12][13] During Team G's performance on April 21, Hasegawa, along with Sugahara Riko, announced her decision to graduate from NGT48 in solidarity with Yamaguchi.

[25][26] A native of Tainai, Hasegawa had been serving since September 2019 also as a tourism PR ambassador for the city to engage in promotional campaigns and events for it, with her appointment being renewed over the subsequent years.