idk i think gift-giving (if at all) folds into acts of service, he would give his lover gifts if that was how they preferred to be shown love, but it wouldn't be how he personally expresses his love
"are you still mad at me? no, baby! you're going to bed mad at me?" *starts singing* "i don't want to go to bed mad at you! no i dont want you to go to bed mad at me"
nanami who never gets too close to anyone bc he fears leaving them behind due to the risks of his occupation vs nanami finally finding someone he wants to live for and grow old with