Your castle is the one thing in a kingdom-war strategy game that's entirely under your control. Nobody can log off and take your progress with them, and no server population affects how fast it upgrades. That also makes it easy to upgrade it in the wrong order. Here's what actually matters in your first week.
Early game, the temptation is to spend resources on whatever upgrade looks most impressive. Resist it. The upgrades that compound fastest are the ones that reduce recharge time or increase capacity — because every hour you save gets reinvested into more attacks, more monster battles, and more resource generation. A castle that recharges 20% faster is worth more in week one than almost any single cosmetic or situational upgrade.
New players sometimes panic about being attacked and pour resources into defensive upgrades before they've built up enough progress to actually be a target. In the first few days, you're rarely a priority target for anyone. Spend that early window on growth, and shift toward defense once your castle level and resources make you worth attacking.
Tutorials are designed to teach mechanics, not strategy. Once you're through it, take five minutes to actually look at your upgrade tree and resource income before you spend anything. A little planning at the start avoids the common mistake of spreading resources thin across many small upgrades instead of pushing key ones to a meaningful level.
Daily tasks and login rewards exist to give you a steady trickle of resources on top of what you earn from battles. Treat them as a floor, not your main income — log in, clear them, and put those resources directly toward whatever upgrade is next in your plan rather than letting them pile up unused.
If you've already joined an alliance, more experienced members have usually already made (and learned from) these early mistakes. A two-minute question in chat — "what should I upgrade first?" — will often save you several days of inefficient spending.
In Call of Anime, castle upgrades feed directly into how effective you are in both monster battles and player combat, so time spent optimizing this early pays off across every other part of the game.