Yuusha ni Narenakatta Ore wa Shibushibu Shuushoku wo Ketsui Shimashita. OVA

Raul's sister has come all the way from Raul's home village to see her brother who has "become a hero." Raul and his fellow co-workers think its a better idea to trick his sister to thinking Raul is a real hero.

(Source: Wikipedia)