Chotto Dake ai ga Omoi Dark Elf ga Isekai Kara Oikakete Kita is a Manga/Manhwa/Manhua in english language, SUGGESTIVE series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Hinata is a high school student who reincarnated into a different world and became a hero by the power of God. He defeated the Demon King with the help of the dark elf Mariabelle and other friends. Thus he safely fulfilled the wishes of God and returned to this world. One month after Hinata returned to this world, for some reason Mariabelle also came here from the other world !! The reason she came here is to be with her beloved Hinata !! ~~~ With heavy love and a teaspoon of jealousy, she attacked Hinata every time he refused !! (in many ways). Will Hinata, who has decided to live with Mariabelle, be able to live safely (?) !! A sweet and thick romantic comedy woven around the dark elf beauty's slightly heavy schizophrenic love !!!