Part 2 would've been 10x better if it was primarily about Asa and Yoru. With Asa discovering her devil side as she now has the power to enact her pent up desires in seach of a fulfilling life while Yoru descovers her human side as she discover fondness for human feelings of intimacy and love.
Denji playing a supporting role as he is experienced, displaying maturity and growth he attained at the tail end of Control, he would complete his character arc by passing the torch and saving a girl stuck in the same kind of situation as he was in Part 1, thus saving himself.