It’s certainly the thought that counts, and he’s very touched by the gesture. True, he could buy his own chocolates, but they wouldn’t be something picked out of care from someone else, now, would they? 

After reading the note, Hakuba carefully peeled back the wrapping paper until he was able to sneak into the box and take a piece to nibble on during class, hiding the rest in his bag for later. 

There would definitely be a White Day gift in Kuroba Kaito’s future.