I can't help but think that his method for getting rid of the second body is far inferior to his first method. Burying an entire corpse in the woods almost never works in mangas- the corpse is often not buried deep enough, and hikers or landslides or heavy rains can unearth it. Seriously, he should have just done what he did with the first body- cut body up, flush it down the toilet. Take bones home, grind it with a mortar and pestle, scatter powder to the winds. Nobody would ever know.