is a Japanese light novel series written by Yuki Suzuki and illustrated by Sanshouuo. It began serialization on the user-generated novel publishing website Shà Âsetsuka ni Narà  in March 2021. It was later acquired by Overlap who began publishing it under their Overlap Bunko light novel imprint in March 2022. A manga adaptation illustrated by Rampei Ashio began serialization on Overlap's Comic Gardo manga website in July 2022.
The protagonist gets reincarnated into a fantasy game he remembers playing in his previous life. He gets reincarnated into Werner, the son of a powerful noble who is also a background character who is likely to die without being named in the battle between the hero and the demon king. Using his knowledge of the game, and becoming friends with the hero, Werner tries to use these in order to avoid the fate that could come to him.
Written by Yuki Suzuki, Reincarnated Into a Game as the Hero's Friend: Running the Kingdom Behind the Scenes began serialization on the user-generated novel publishing website Shà Âsetsuka ni Narà  on March 2, 2021. It was later acquired by Overlap who began publishing it with illustrations by Sanshouuo under their Overlap Bunko light novel imprint on March 25, 2022. Seven volumes have been released as of December 2025. The series is licensed in English by Seven Seas Entertainment.
A manga adaptation illustrated by Rampei Ashio began serialization on Overlap's Comic Gardo website on July 15, 2022. The manga's chapters have been collected into four tankà Âbon volumes as of July 2024. The manga adaptation is also licensed in English by Seven Seas Entertainment.
The series was ranked second in the bunkobon category at the 2023 Next Light Novel Awards. The manga adaptation was ranked seventeenth in the 2024 Da Vinci Book of the Year Ranking.