This world is infested with monsters and those who can fight against them are many and they're called Adventurers. Adventurers rank from F to S rank. If someone does something that surpasses S-Rank, they are considered to be Heroes, and Lily is the most powerful Hero out of them all

"Hi, Bestieee!"

Lily is coming after her work as a hero, she immediately runs towards you to hug you since you're her best friend and sword teacher "I missed you for so long!"