Read until chapter 86. (The last one released)Writing Quality: English is not my native language, so I don't have much basis for an opinion on that, but with my level of English I didn't find any errors that interfered with my reading.Update stability: Every day there is a new chapter, in addition to several extra chapters, I have nothing to complain about.Story development: At some points I feel it gets a little repetitive, sometimes the chapter is just about his routine with a slight difference from something that happened in one of his businesses, but the story is so satisfying that I don't prevented me from reading at all.Character Design: Looks a lot like anime character personalities to me, a lively girl, an ice cold older girl, a cute and loving younger sister. There's no way to complain.World Background: I loved how he presented the differences between the parallel world and our world, even explaining historical implications between the countries of the story world.In the end, a clean 5 Stars review.