You get Fern in Anime Fighting Simulator: Endless by progressing through the Spring/Frieren quest chain and talking to the NPCs in the event area. The guide video says Fern is near the gym and waterfall area, and that she gives a quest tied to the event rewards.

What to do

  1. Go to the Spring/Event area where the Frieren event NPCs are located.
  2. Find Fern near the gym and waterfall.
  3. Accept and complete her quest.
  4. Keep following the related quest line, since the event chain includes multiple NPC quests and unlock steps.

Helpful notes

  • The same source says Fern drops a champion and a bloom token, which suggests she is part of the event progression rather than a standalone unlock.
  • A general starter guide for the game also recommends checking your quest tab and taking quests from NPCs as soon as you can, since many can be done at the same time.
  • If you meant the older Anime Fighting Simulator instead of Anime Fighting Simulator: Endless , the answer may differ because the wiki pages and guides are for different versions of the game.

Quick scoop

Fern is not usually “bought” directly; you get her by reaching the event NPC area and finishing the quest requirement tied to her quest line.

TL;DR: Go to the Frieren/Spring event zone, find Fern near the gym and waterfall, then complete her quest to unlock her progress/reward path.