Ore Dake Tsukaeru Tensei Skill [Magical Sword] de Donna Kyonyuu mo Akume Ochi! ~Ore no Kokan no Seiken wa Isekai Bijo Tachi wo Bisho Nure Shouten e to Michibiite Iku~

The protagonist, Kikutaro Sakamoto, hit his head hard while masturbating in VR and died at the same time as ejaculating. Alphaigne, a goddess of the heavens, took pity on his pathetic end and proposed reincarnation in another world. As a reincarnation bonus, he could choose one favorite ability from the skill list. And what the virgin Kikutaro chose was... [Magical Sword]. He was granted the skill on the spot, and immediately tried it out on the goddess! Alphaigne easily fell for him instantly. She decided to accompany him to his reincarnation destination. However, the moment they descended into the other world, the goddess's power was almost completely lost... Incredibly, she had become a literal "female pig"! And so, Kikutaro and the (former) goddess begin their journey to reach the city. On the way, they hear sounds of a struggle coming from deep within the forest...