I was expecting this to be bad, but I was really surprised! I actually got invested in all 3 of these characters in just this short one shot... I would honestly love to see more of these characters... I feel like it would make a great series if we could start when Kouhei's soul entered Haruka's body, and watch them work together to improve her life! This one shot would be an amazing payoff for that first arc (especially for people that know the one shot and know it's coming, but have to go through the suspense of not knowing how it's going to happen)
Point is, this is actually really promising and I hope to see more from this author!