Here are compilations of comics/doujinshi about Valentine's Day. Comics 1-3 were Re-edited and translated by me.
Read from right to left
I CAN HEAR YA (Saburo)
HEART-SHAPED COOKIES (mnmn_ops)
Note: For guys who don't know the meaning of Deku's gift. If Deku received a heart-shaped chocolate known as "Hommei choco", it means either she likes him more than a friend/classmate or a confession. So if you have received this gift, you should reply it by responding her confession or giving a special gift on White Day.