The next arc summary:
The Pope get killed during a robbery of the vault that holds items for summoning. The same items that summoned Cain’s past life parents, those got stolen. In order to select the new Pope, Cain goes incognito as an adventurer and under the request of the gods, he helps one particular clergyman become pope. Hinata also gets some attention and this arc helps with Hinata’s plans to marry Cain as they got stalled since the last time.
The arc after this is where the stolen summoning items come into play. Several teenagers from Earth are summoned as the new heroes. The Empire was responsible for the robbery and they summoned heroes to commit their plan to conquer the other kingdoms, starting with the Beastman kingdom. Cain involves himself in the conflict however he cannot fight on the frontline because he is still underaged. He goes as a healing mage. And yes he probably has a new princess who wants to marry him based on what was published.
The web novel stops here on indefinite hiatus. Light novel also went on hiatus, possibly axed.