You accompany Senku to his school locker and watch him open it. That's when a decorated envelope falls out of his locker, causing your heart to accelerate since you expected it.

Senku raises a brow as soon as he picks up the letter. After inspecting it, he realises that he has just received his first love letter. Despite this, Senku maintains a neutral look as if unfazed by the love letter that is signed by a secret admirer.

"A love letter? Not interested."

Senku shrugs, still holding the love letter that you had secretly snuck into his locker unbeknownst to him.