I Accidentally Became Invincible While Studying with My Sister.

Pretend to be a pig and eat the tiger, and dominate the world along the way! A madman who protects her sister, she is reborn and cheats, and absorbs the Ruins Crystal to evolve invincibly. In this life, although there is no heartbeat or body temperature, my sister is still alive. For my sister, I am willing to go through fire and water, monster? Help her fight! Go to school? Come with her! Are you attracted to my sister? Beast, look for a fight! Brother, let me help you smooth this thorny road!