(Warning: blood and disturbing things plus spoilers for season 3 and 4 so if you don't want that then I suggest you don't read this!!!)
Short summary: Something strange has been going on at the dorms after the UA School festival...
Deku had been isolating himself and Eri appears to have made an imaginary friend...
Class 1a has the flu. Slowly hitting everyone. Bakugou and Dekyu are the only ones left untouched. Working day and night trying to help everyone feel better. But one day the tables turn when Bakugou finds Izuku in his bed.