Leanna's Slice of Life

In a world where demons exist, Kain and Leanna live in a relatively peaceful village. Kain is a natural-born fighter who hunts demons around their village. Leanna is an innocent and kind-hearted young girl, but also kind of a bumbling idiot. The two eventually marry each other, capturing the envy of the entire village. As they prepare to start their happy life together, something happens.