Osakana (O・S・A・K・A・N・A) APK - Tapping the fish sends them into battle against enemies.
Spawning fish requires resources, and you can only spend up to a set maximum. Therefore, carefully choosing when to summon fish is important. Upon touching enemies or whitespaces, fish will automatically start attacking. Attacks inflict damage on opposing castles or characters. The goal is to deplete the enemy castle's health points to zero to clear the level. However, if your own castle's health points reach zero first, you can restart as many times as needed. Since there are no numerical displays for health values other than the castle, you must pay close attention lest your fish army is defeated.