Himari Uehara is the cheerful drummer and mood-maker of Afterglow in the Japanese multimedia project BanG Dream, also known as Bandori. Her catchphrase 'ei ei oh' is her way of rallying her bandmates before practice or a live show, and fans clipped the energetic delivery into a standalone soundboard button. Short anime voice clips like this spread through TikTok edits, Discord servers, and rhythm game communities, where Himari's chant became shorthand for starting something together with a positive attitude.