Shittaka Elf to Koibito Gokko

Kanezada Toyama, 28 years old, was forced to work overtime by his seniors and was living a stressful life. Until one day, when he wakes up to find a beautiful elf girl from another world lying beside him...? Kanezada decides to take care of her for the time being. In order to try to fit in with the modern world, she claims to be his girlfriend! A romantic comedy with a cute elf! (Source: Shonengahosha, translated)