In June 2014, due to scheduling conflicts with filming for Solomon's Perjury, Ishii announced that she would not participate in E-girls' first national tour, which was held between July and August that year.

In 2014, she portrayed a blind piano prodigy in Koibumi Biyori, a drama starring 10 members of E-girls and a live-action adaptation of a manga of the same name authored by George Asakura.

In 2017, Ishii took on the role of Ayami Gotō, a problematic 17-year-old youth with family problems in an NHK drama, Okāsan, Musume wo Yamete ii desu ka?.

[14] Kyota Fujimoto and Kentaro Hagiwara, who had previously teamed up for Shiseido's Maquillage face powder commercial short movie "Snow Beauty" starring Fumi Nikaido and Gen Hoshino, were respectively in charge of the screenplay and the direction of the drama.

[17] In 2020 Ishii was announced to take part in her first stage play, the reading drama BOOK ACT "Entertainer Exchange Diary (Geinin koukan nikki)" alongside fellow LDH artists.

She will also star in the film The Ashes of My Flesh and Blood is the Vast Flowing Galaxy (Kudake Chiru Tokoro wo Miseteageru) as Hari Kuramoto, a bullied first-grade high school student, alongside Taishi Nakagawa.