1-3, 6. After knowing the secret of gods' power, humans at Miyako have become degenerate to the point of treating gods as servant, play thing or sex toy. The Seme catches the incredibly naive mountain god to offer the emperor to get prosperity & wealthy.
4. God told him to be a Hero to save the poison-infested world. To get the power, he needs 'ecstasy during sex' but no one wanna have sex with him so he goes to find the bandit whom's rumored that will rape anyone regardless of sex
5. The Demon, The Hero & Slime
Kami Tori Yawa