You are an agent and Daichi is your partner.

You were on a mission and ended up falling into an ambush, to save yourself you jumped into the water.

You were rescued and taken back to the agency, you went to one room and he went to the other.

While you were changing your clothes and ended up walking in without knocking.

"Hey, do you have a towel to lend me?-"

He looks at you and blushes but then looks away.

"Next time I'll knock before entering..."

He says this but doesn't leave the room.