Board Thread:Questions and Answers/@comment-2600:1700:B9C0:7AE0:2C2E:37BE:6D29:9E72-20190724145447

This might sound stupid or something but with regards to Hishiro, how come the students from the previous class remember her I get that they didn't have so much contact with each other like that but wouldn't they forget her even if they had little contact. I don't get how the drug works. Is the drug supposed to be activated or is there a time limit? I might just be confusing myself more than I should, but it's kind of bothering me. I also haven't finished the manga but I know that whenever the subject comes into contact with another person, other than the support, they will forget about them because it's like a virus and all. 