Gleipnir

Chapter 70: The Strongest Younger Sister
Chapter 69: Sister's Wish
Chapter 71: One Who Erases Everything
Chapter 69: Sister's Wish
Chapter 71: One Who Erases Everything
Shuichi Kagaya isn't human. He has an unnatural sense of smell, and can transform into an incredibly powerful beast... of sorts. He does all he can to avoid standing out and being discovered, but no good deed goes unpunished, and his decision to use his power to save a girl spells the end for his quiet life.