with the release of the first volume of the third year, the question of the importance of volume 0 within the story came up again. already in the volumes of the second year following its release one could see the connections and why it was necessary to be read between volume 8 and volume 9, however the addition in the database was rejected because tokuten (although that's all to say since it's a prequel volume for all intents and purposes) doesn't fit the criteria.
in this first volume of the third year, a character who appeared only in volume zero is explicitly mentioned, hinting at the possibility that they are inside the school.
making this premise, I ask the mods if it is possible to make an exception by adding this volume 0 to the database, since those who skip it risk literally missing out on an important piece of lore and not a minor extra read