Game no Naka ni Iru!

Synopsis

Mikan (Idiot), Matcha (Serious), and Kassis (Cool Idiot) are a trio of JK friends. One day, they start playing a famous retro game, "Dragon Journey 3", when they all get sucked into the game screen!? When they wake up, they find themselves in a familiar world in the game!! Fights, deaths, and resurrections abound in their quest to escape this world! Gut-busting adventures of the girls in the game, start!! (Source: Mangadex)