After Becoming Invincible, I Was Summoned by My Senior Sister!

His senior sister died to protect him in his previous life. After a hundred years, he became invincible and finally took revenge. At this time, he was suddenly summoned by his senior sister from another world! The regrets of the previous life will be made up for in this life. Anyone who insults senior sister will be killed! Anyone who offends my senior sister will be killed! With the sword in my hand, I will protect my senior sister and kill all the monsters in the world! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.