FTHT-286 We are invisible men ~ A certain university's women's dormitory. Revenge on the c

A women's dormitory at a certain university. The students look down on the adults, including the lecturers and caretakers. Unable to argue back against the cheeky girls, he is persuaded day after day. One day, he picks up a mysterious supplement. When he drinks it, his body becomes transparent!!! This is his chance! He'll get revenge for all the grudges he has held against them!! The lecturer and caretaker's revenge has begun!!!