On the official site for the video game for smartphones from the franchise High School DxD special event entitled “Hurry! I'm Sexy Santa!“, Available within the application from December 18. The video game is only available in the Japanese market and in a catalog QooApp in this link. The event is described as follows:
«It's almost Christmas. I go to bed waiting for parties and presents. Then I heard a whisper on the balcony… When I opened the window, I found the girls in their Santa Claus costumes! “Surprise! I couldn't wait to come here…”. “Are you surprised? Hmm, alas, but I will not let you sleep tonight! “My sleepiness is completely lost in Santa Claus' s very revealing attire. What a surprise to receive these beauties as a gift! I'm not going to sleep! This year's Christmas has just begun!».
High School DxD Summary
High school student Issei Hyoudou is a regular who does nothing productive with his life, spying on women and dreaming of having his own harem one day. Issei seems to be searching for things when a beautiful girl asks him out on a date, even though he's a fallen angel who brutally kills him. He gets a second chance at life, however, when the beautiful senior Rias Gremory, who is a world – class demon, revives him as his servant, recruiting Issei into the ranks of the school's Occult Research Club. Slowly adapting to his new life, Issei must train and fight to survive in the violent world of angels and demons. Each new adventure transcends many fun (and racy) moments with your new classmates, keeping your new life a secret from your friends and family at DxD High School.
(C) AD 踏 一 榮 ・ み や ま 零 ／ 株式会社 株式会社 KADOKAWA 刊 ／ ハ イ ス ク ク ル ル D × D HERO 製作 委員会