Toshiaki Yume is a virtual singer/synthesis character from HLVisual ProSynthSekai

He debuted in 2021 and was signed by HLVisual Records. On April 27, 2021, he released his first cover on YouTube.

Toshiaki Yume In Japanese, 俊 (toshi) means "talented, handsome", 利 (toshi) means "profit, advantage", and aki means "bright, light, clear". 夢 (yume), meaning "dream"

His logical vocal range is A2 to B4

Toshiaki has simple school black hair and apple red eyes. He wears the HLVisual idol costume, which consists of a white shirt and a white T-shirt similar to the idol costume running down his shoulders and wrists, as well as white pants and white shoes.