Yikes! This is also one of my entries for this month's water anime recommendation ahahaha. Anyway, I really relate to how catching the mystery was. The mystery that shrouds that sudden attack on them was really one of the reasons why I decided to continue watching this anime. Same with you; I also did not read any synopsis—I didn't even watch the trailer because I wanted to really deduce what the mystery was. The start was pretty interesting, but later on, it became dragging for me because I somehow predicted the cause of their misfortune, and the major clue was even showed in episode one. Nevertheless, it ended satisfyingly, which was really a relief for me.