Hiroyuki Asada is a Japanese manga artist who is best known for his gaslamp fantasy series Tegami Bachi. The first manga series he created was called I'll, and was a basketball series. All of Asada's manga were serialized in the monthly shōnen anthology Monthly Shōnen Jump. He made his debut in 1986. He acquired a fanbase with Mint: Sleeping Rabbit, Renka by degrees, and his popularity improved with I'll. In his personal life, he is part of a unit with Shou Tajima and Takeshi Obata, and his creation activity with "AQUARIOS 3".