May 5 is the birthday of Miko Iino, so the official Japanese website for KAGUYA-SAMA: LOVE IS WAR -Ultra Romantic- has posted a special illustration of her wearing a miko (a young priestess at a Shinto shrine) costume.
Icons, wallpaper, and Twitter header using this illustration are also available for free on the official website.
Her wearing a miko costume is, of course, a pun on her name.