Thanks for the new chapter!
The 3 girls are technically like Yuu's mother divided into 3 (Acting, Physical Prowess, Intellect), it's like Gotoubun no Hanayome, their names are even using numbers like the Nakano Sisters (Kazu 1, Ni 2, Mi 3) and like what happened with the Nakano sisters, I would be sad if the rest will be rejected and I hope these 3 and Yuu will have a harem ending (though technically the Gotoubun ending is somewhat still harem because the other 4 are still going wherever the couple goes). On the flipside, I will be pissed if Hirakawa Aya will go for a 'pick your own ending' route like what happened to BokuBen.