BUON COMPLEANNO HAYATO~
-cue sparkle dust-
Backstory for this is Yamamoto slips a note into Gokudera's book (LOLGEOMETRY) so when he sits down for a lonely peaceful birthday study session- SUPRISE! :D
Excuse my lack of creativity and crappy penmanship in the Japanese department. It is supposed to say-
大好きです/daisuki desu/I like you very much. Feel free to correct me, multilingual children.