Blessing of the Campanella - Season 0 Episode 7 OAV Based on the Shukufuku no Campanella - la campanella della benedizione - adult game by Windmill.
Overview: The story takes place in a trading city Eta'Aria. Leicester Maycraft is an item engineer belonging to an adventurer guild "Oasis". One night, he is at a party with his friends to see a meteor stream on the rooftop of a chapel.