Big Breasts Party NTR

Gard, a large isolated island far from the central continent... This was once the base of the Demon King, who tried to rule the people with power and monsters... However, one hero rose up to save the suffering people, and together with his like-minded companions, he defeated the Demon King and brought peace to the world.

...100 years have passed since then... People have moved back to Gard and enjoyed peace... However, ominous signs have begun to appear again in Gard... The number of monsters on the island has increased dramatically, and rumors begun to spread among the people of Gard that the Demon King has returned.

The city of Bonner was founded in Gard by the former hero... The shadows of many monsters are now creeping up on the central city of Bonner, which is now part of the central continent's Ludo Kingdom. To combat the sudden increase in monsters, the lord of Bonner has called on powerful adventurers besides the soldiers, and grant rewards and titles in exchange for defeating the monsters.

Hopefully a hero will one day appear and defeat the demon king.

Meanwhile, in a village deep in the mountains founded by the wizard Dean - a former companion of the hero, a boy named Kuruto is leaving for the royal capital tomorrow with his childhood friend, the magic warrior Arika...

[From Dlsite]