Hentai is based on the popular novel and anime series "Re:Zero". This video was released by the Studio Grand Cross (OreimoPlus, Alu Plus) in 2018. 

This movie is like a fan fiction. The protagonist of the story marry REM, one of the twin sisters who worked for Mr. Ruin. It's his first night with an innocent girl. Although deal is happening at all not at night. She had short sky blue hair and huge juicy Tits. But most importantly, she is madly in love with the hero.