Hello, I propose two suggestions that I think would improve the game.

1. Being able to cancel your mission in Sakura's Gift Event

Says it all. It seems weird to me that you can be stuck with a mission that you can't complete. Last time this happened the mission didn't reset on the next day, leaving me unable to participate in the event further. Adding a refresh mission *on with a cost or resetting the mission on the next day would make it so you don't get stuck with things like "Win in Ranked Battle". Which leads me to my next suggestion.

2. Two-way ranked battle

It seems odd that the top 5 ninjas get to challenge players who are lower rank than them but not vice-versa. This means that (in my case for example) you are at a high enough place that everyone's power and ninjas are simply too strong to defeat. Added with the fact that these players also play the game, it makes it nearly impossible to bridge the gap and makes the ranked battle feature pretty much useless. I propose making it so that you c*so have the possibility of refreshing for players in a lower rank for the sake of mission completions (e.g. Sakuras Gift event or Missions Mobilization General). Of course, it's still possible that you may no longer beat them since they are also improving their teams but the fact that you managed to get to a rank higher than theirs gives you a fighting chance compared to instantly dying to teams with a huge power and ninja difference.

[BONUS] 3. Reducing lag

This could help with cross-server interactions and other lag issues. Have an option for your sprites to remain static instead of animated during battles. It's pretty self-explanatory how this helps.

What do you think? Are these feasible and valid suggestions to improve the overall game experience?