I really loved this manga when I read, BTW wasn't here already the second volume? anyawys I feel that this could have easily one volume more, actually that would be great ;D
I dunno about a sequel as it's already been three years and the author has released two other different titles.
Although it would be nice to see the typical manipulative bastard character trope get his comeuppance, but it's such rarity to see that I'm not holding my breath that it'll actually happen.