Ayumi's replay 7 and Mai's replay 3 are from Favor Exchange interaction. Call them to the office during the sandbox section and ask for it. If the option doesn't appear or they refuse it, they need higher corruption/affection and/or low grades and/or strikes to their record.
Ayumi replay 3 is Her's and Soushi NTR. There's multiple posts about how to get it in the comments already, but basically encourage her to pay her debt to Soushi and not have her grades be high after the first exam event.
Secondary Characters replay 5 is the Suzu's bat's other route. You already have the replay 6, just choose the other option.