Super Sentai: The Time-Traveling Police Officer

The protagonist, Long Xingtuo, has just made it into university when he unexpectedly accepts a request from Red of the Super Sentai and transmigrates to the Super Sentai universe, much like Kaizoku Sentai Gokaiger. Inheriting Red's power, he sets out to investigate a mysterious figure with the abilities of villains from every Super Sentai series, forging bonds with the various teams along the way. But something seems to have gone wrong with his transmigration: at the very beginning, he is adopted by Doki Kuruga, the boss of the Dekarangers. To familiarize himself with his powers, he joins the Space Police Academy and eventually makes his debut as a new Dekaranger addition with two forms. His name is “The lawman who burns evil with the flames in his heart (and smashes thugs with raging ice and snow), standing between night and dawn: DekaFire (DekaBlizzard).”