[4] In October of the same year, Kobayashi made her runway debut at the GirlsAward 2016 Autumn/Winter fashion show.

She formed a duo named "Yuichanzu" (ゆいちゃんず) with Yui Imaizumi, first appearing in Silent Majority with the song "Shibugakawa".

[4] With Imaizumi's graduation in 2018, Kobayashi and Mizuho Habu formed another duo named "Senko Shimai" (線香姉妹), appearing in Ambivalent with "302-Goshitsu".

[2] Additionally, on 13 March 2019, she released a photo-book titled Kanjō no Kōzu (感情の構図), published by Kadokawa.

[11] Kobayashi's first independent acting role was in the 2020 live-action adaptation of Wasteful Days of High School Girls by TV Asahi.