I, Sekiryuutei, Intercept Hyoudou Issei at the Beginning

Traveling through Devil High School, becoming Hyoudou Issei's classmate, and awakening the [Destiny Usurper System]? Can you become stronger by plundering the opportunity of the Son of Destiny? I'm not polite about this! The opening cut of [Sekiryuutei's Cage], Hyoudou Issei, times have changed! Your plug-in is mine now! Rias's first time is mine! Elsa's Virgin Smile blooms only for me! Akeno's knee pillow, Xenovia's holy sword, Koneko's shyness... They're all mine! When I activated Tyrannosaurus Mode among thousands of troops and was admired by everyone, you, Hyoudou Issei, could only cry in jealousy in the corner. Don't get me wrong, I'm not targeting you, I just want to tell you - from the moment I arrive, you are not even qualified to be a supporting role!