
Quick answer — Rei Hiroe worked on Black Lagoon: The Second Barrage (Original Creator), Black Lagoon: Roberta's Blood Trail (Original Creator), Black Lagoon (Original Creator) and 4 more anime.
Rei Hiroe worked on Black Lagoon: The Second Barrage (Original Creator), Black Lagoon: Roberta's Blood Trail (Original Creator), Black Lagoon (Original Creator), Re:CREATORS (Original Creator), Black Lagoon Omake (Original Creator), BIKINI WARRIORS: Genkai Toppa, Okite-Yaburi (Original Character Design), Bikini Warriors (Original Character Design).