On July 7, 2023, Hirano and Jinguji announced on a YouTube livestream their new affiliation to Tobe co., Ltd, established by Hideaki Takizawa.

It also stands for love, "愛" in Japanese, and I (as in "me", "myself") in English, with the meaning of immersing themselves into the project, taking it as a unique thing for each one of the members.

[11] On April 14, 2024, Number_i made their debut appearance on the '88rising Futures' stage at the Coachella Valley Music and Arts Festival 2024, performing FUJI, and a remix version of "GOAT" with Jackson Wang.

[17] The group was recipient of a negative X post in January 1, 2025, later erased, by cosmetics company Reju, where its community manager called them traitors and that their appearance in NHK's Kouhaku "rots my eyes and ears".

After the backlash received from the group's fans, Reju posted an apology and decided, on January 5, to close operations definitively.