The Haunted High (1994)

Another film by the Konaka brothers. There is a tunnel under the school, and Alice, Juri, and Reika get lost in a wonderland. The Men In Black played by Morishita Nittan (wearing rabbit ears) was a sight to behold. The story is about UFOs, but it's an offbeat comedy (what's a "school ghost story"?). The naming of the character, along with the genius gamer Mihime Goto from "Yokai Teke Teke", was carried over to "Alice 6", and was also repeated in the Glams game "Alice in Cyberland". - Alice 6 Chiaki J. Konaka's Web

Unfortunately the movie The Haunted High is not yet available on HBO Max.