I'm the Hero, but the Demon Lord's Also Me, Vol. 2

Ordinary (?) high schooler Yuuma Tsugari possesses the power of both the hero and
the demon lord, and so far, it’s caused him nothing but trouble! Frequent visits from
otherworldly guests are one thing, but now, the princess's younger sister and the
Demon General are at each other’s throats, and their rivalry’s just getting started! Will
Yuuma ever be able to have a normal life again?!