[4] They began uploading covers of anime, J-pop and vocaloid songs onto YouTube and Niconico, gaining popularity and attention under their aliases Tonkhai and トンカイ.

Its title track was chosen to be the theme song of the anime adaptation of the original light novel series Tantei Team KZ Jiken Note.

[17][18][19][20] In 2017, Diana branched out in their engagements, appearing in many events in Japan like the KIDSTONE Summer Presentation Program[21] and stateside anime and manga conventions, like Ohayocon and Animazement, as well as on TV and in print.

In February, they first provided their voice for English-speaking roles of Joule and Lumen the double identities of the heroine of Azure Striker Gunvolt, in the English dub of the original video anime adaptation of the game, released worldwide on the Nintendo eShop.

[30] The year also saw them venturing into acting, as they appeared in the January TV Kanagawa drama "Shiba Kōen", the February commercial short movie "Man'yō ni Ikō."

They continued to pursue voice acting and appeared in Japanese-speaking roles in the anime series "Meow Meow Japanese History" they had previously provided ending themes for, voicing historical characters like Heian period buddhist monk Taihan in February, samurai Egawa Hidetatsu and legendary folk hero Ishikawa Goemon later on in June.

They went on to perform the theme songs "Fight Yourself" for the readers theater play "Dragon Zakura~2nd season~" in January and "Here and Now" for the visual novel Caffeine: Victoria's Legacy in March, for which they also voiced the main character Eliza.

Since February, they have been voicing the Japanese-speaking role of Japanese English teacher Momo Tomozawa, a main character of the well-received Benesse franchise "Kūsō Gakuen Pantasia".

In December, they voiced the Genshin Impact character Dehya in the Dillongoo Studios web anime short "Nameless Road" for MiHoYo's regular fan event "HoyoFair 2023".

On April 15, they released their second digital single "Genshindou", providing the theme song for the first ("The Shogunate") and fourth episodes ("Visiting Neo Inazuma") of the MiHoYo commissioned Genshin Impact alternate universe anime series, "Progenitor".

On July 28, Diana released their third digital single "Heiwa Sanka", the theme song for the Yostar commissioned Arknights anime short film "Legend of Chongyue".

In July, Diana performed the theme song "Set Sail" for the summer event "Beauty Full Shot" of the Shift Up smart phone game "Goddess of Victory: Nikke".

Later that month, production company Qubic Pictures teased the singer's live performance of a song at their panel discussing their 2025 Netflix anime series adaptation of the novel Leviathan by Scott Westerfeld at Otakon.

In December, they performed the theme "Michibiki no Hoshi" for the fifth episode ("Invasion") of the MiHoYo commissioned Genshin Impact alternate universe anime series, "Progenitor".

Diana performed the theme "In Another Story" for the MiHoYo commissioned Honkai: Star Rail alternate universe anime short film, "Millennium Idol: In Another Life".