I think the chapter is meant to highlight how Nagi and Sousuke respond to Erika differently like where Sousuke would've been delighted by the lights and Nagi focused on the wasted electricity or where Sousuke would've cherished taking a trip to shop for New Years and Nagi preferred buying...
In the recent chapters with Natsumi and Yuuto, he thought that Natsumi might view Futaba as something more than a friend.
It's a concept that the author introduced in the manga.
Osananajimi to wa Romcom ni Naranai
Negai wo Kanaete Moraou to Akuma wo Shoukan Shitakedo, Kawaikattanode Kekkonshimashita ~ Akuma no Niidzuma ~
By Spring
Thanks for completing The Dark Brown Editor and the Shota Mangaka!
I'm hoping more chapters of Tonari no Kuroki-san wa Nomu to Yabai will be uploaded in the future!