Use currency to open "Stars" for anime companions (like Nezuko or Flame Overlord) that provide massive click and Yen multipliers.
Rebirths are essential for unlocking new worlds (like Lava Island or Ocean World), which offer better pets and even higher world-specific boosts. Pro Tips for Fast Progression Anime Clicker Simulator | Infinite Rebirths
Each rebirth provides Gems, which can be spent in the Rebirth Shop for permanent upgrades like faster opening speeds, more storage, and higher critical click chances. Use currency to open "Stars" for anime companions