Takuya showed how to quickly and efficiently clear misunderstandings and reaffirm his feelings for Shion, and by the next day, he's a lot more confident in his position and straight up flusters Mikitani with his smile. Yeah, she's not in control of the conversation now, lol.
Nijima's plan to get close to Shion just took a massive blow at the end, with the two girls getting Takuya involved. He will try some cheesy rivalry to try to get a W, but that's gonna go downhill fast. At least he will realize that, cut his losses, and concede defeat.