There's more actually. The battle system is really easy but the downside is that it will drag on for half an hour or more due to the turn-based system, and worsened when the general start spamming their special power. The most important thing is that there's no way to save the game in the middle of the long and boring battle. If you want to continue with the story, then you must finish the fight.
However, if you do want to try this VN, then I'll suggest that you do Ren, Sei, Shia, and Karin's route only. They might be a side heroine, but their routes is very awesome, especially Karin-sama.