KOKIA is a Tokyo-based singer-songwriter best known for her work on game and anime soundtracks—she's contributed to around eight different projects across these mediums. Her voice is genuinely impressive; she once held an opera note for over 29 seconds on national television, which gives you a sense of her technical abilities.

Internationally, she's biggest in Hong Kong and Taiwan thanks to "Arigatou.," a track that became so popular it caught the attention of Sammi Cheng, who covered it. Back in Japan, her most successful release was the single "The Power of Smile / Remember the Kiss," which peaked at #15 on the Oricon charts and remains her biggest domestic hit.