Kakeru Meguri is a second-year student at Minami Myojin Public High School who plays the character named in the VRMMORPG <>. One day a player suddenly appears in front of his eyes, which turns out to be his popular beauty classmate Ririko Asagiri. She believes that if they defeat the demon king they will be able to return to the real world, in fact, Kakeru knows that if a player dies in the game, their consciousness will disappear in the real world. To save an important person, Kakeru possesses the most powerful awaken forbidden force, "Adult Mode".

Note: Ecstas Online was discontinued due to the death of Kakashi Oniyazu on February 2, 2019.