Enemy Senpai

Mizuki Chiba loves her job as a concierge at the Royal Shining hotel in Tokyo, despite her tiny and barely affordable efficiency apartment. She chooses to work as the personal assistant to Royal Shining hotel owner Toma Kira, but that means she has to work closely with the Tsundere, asshole butler, Naoki Kokonoe, who is Toma's usual personal assistant. Kokonoe is mean to her for seemingly no reason at all and refuses to be friendly. Determined to become the best concierge she can possibly be, Mizuki refuses to let Kokonoe get away with his treatment of her, and demands that he give her extra training as a sommelier so that she can recommend wines to guests. Is there some reason behind Naoki Kokonoe's behavior? And why is he so loyal to the head of the company?
This is a rewrite of Naoki Kokonoe's route which I read on the French app of Several Shades of Sadism, by Arithmetic Inc. I was disappointed with his route, and thought he deserved better. In this Otome phone app game, the MC is a concierge at the Royal Shining hotel, run by the Kira family - and 6 gorgeous Kira family brothers, two employees, and a mysterious friend all compete for her attention. She (you the player) chooses one of them in each route to experience a hot romance. But Naoki's was the least hot of them all. Let's fix that here and now.
I used several events from the original route if I thought they were good, but if they weren't good, I changed them. I changed a lot. Does this have a few spoilers and events from the route that hasn't been translated into English and probably never will be? Maybe a few, but you should just read this instead. I wanted you to have a good slow burn hate-each-other-at-the-beginning tsundere romance, which you won't find in the original app. I gave you a better MC for this route too. (It's a great game, I love it. Play it and give Arithmetic money.)
There will be smut. But it's at the end. Get ready for a slow burn as hate turns to romance.