Hello there.
Now, before you could do your work, I'm going to give you a fair.
If you are ever going to do a 100 Girlfriends Who Really X5 Love You, do not, I repeat, do not add Rentarou's girls into your harem. Rentarou deserves them as much as they deserve him, so if you want to make a harem, get some crossover or original characters in your harem.