Hiten No Asuka ~Isekai No Shoujo Ni Saikyou Takara-Gu Ataeta Kekka~ summary:

Kashiwagi Yuuto, who was bored with his life, died in an unexpected accident. He was given the ability to create holy treasure tools from God after his death. Yuuto was thrown out to another world and met Asuka, a girl who wants to be a hero. A scarlet swordswoman and a Captain of the Royal family's imperial guard and a female hero whom every citizen yearned for, were engulfed in the secret pleasures of being a woman...