Kono Subarashii Sekai ni Shukufuku wo! 2 OVA

Bundled with the 12th volume of the light novel. Kazuma meets a novice adventurer called Ran who claims to be Kazuma's fan. A quest is proposed to Kazuma and his party in front of Ran, so he accepts the quest to look good in front of his fan; after some convincing, they all go to fight the metal golem.