Choi Kuzu Shachiku no Isekai Harem Kenkokuki

A corporate drone who died from overwork suddenly wakes up... only to find a busty goddess before him!? To save humanity from the demon race, the protagonist Asagiri Kou is transported to another world. Thanks to the goddess's power, he's rejuvenated and starts by defeating monsters and leveling up! Using magic skills, he survives in the wilderness while beginning to build his own private paradise, free from anyone's interference. Then, a mysterious and beautiful elf named Luna appears, challenging him to a duel...!? "If you can defeat me... you can do as you wish with this body!!" At first, he only planned on a kiss if he won... but before he knows it, the naked elf is in front of him!?