Kaguya-Sama: Love Is War Vol. 15 (manga)

Two high school geniuses scheme to get the other to confess their love first.

Two geniuses. Two brains. Two hearts. One battle. Who will confess their love first...?!

Turns out confessing your feelings is the easy part of a romantic relationship... Now Kaguya and Miyuki have to figure out how to behave in a relationship. Kaguya retreats behind the ice shield she built to protect herself years ago. Miyuki believes only an ideal version of himself is worthy of love. Ai/Haski, as usual, is caught in the middle. Will our two not-star-crossed lovers ever learn to let go and just be themselves...?

First, you have to love yourself.