Patch notification (v0.0.1.1)

- In addition to the current email authentication 3-way login method, improved login using PIN without personal information. Selected during initial registration.

- Added item drop function (currently, heroes can interact through shared storage even when they are far away, but it is not intuitive and inconvenient..)

- Changed the design of Artemis, Bagatur hero skins.

- Changed title/battle background music.

- Other minor bug fixes.

We will review other changes to the overall direction of the game (PvE content) over time. ^^