Read up to chapter 6,
Seme is in love with this book character and meets this guy who look just like her, so he confesses and they go out, the more time they spend together the more the guy resembles hotaru however the more time they spend together the more the seme wants the uke to be less like hotaru, after getting jealous of another guy the seme realise what he wants is the uke and not hotaru, he starts caliing the uke by his real name andbgets to see side of him that are not like the character at all, it turns out (not surprisingly) that the uke actually fell for the seme earlier and found out he liked hotaru so he pierced his ears, dyed his hair and changed his attitude, all to make the seme fall for him, after hearing all this the seme is honestly overjoyed and thdy are happy awkward shy couple together
Hotaru wa Ashita Shinu