Starting with a quadruple kill, Araragi Koyomi, who originally thought he would become the king of plagiarism and establish his own 2D empire, discovers that this world is not as simple as it seems. He then lives a "happy" daily life where his butler is Sebastian Michaelis, his security chief is Saitama, his club members include angels and demons, and the companies he acquires have the fathers of esper and dragon keepers. The worlds involved currently include "The quintessential quintuplets", "The disastrous life of Saiki K", "Kuroko's Basketball", and "Miss Kobayashi's Dragon Maid."