What if FMC and Takt aren't actually dating? For as close as they appear to be in class initially on 2 different occasions where MC wakes up shouting FMC's name. No one seems to know she has a boyfriend already except the MC and Umimi who was introduced later in the story. At the very least, the only tension as far as the drama tag is concerned is from that one relationship and MC deciding to reject every girl that throws themself at him. Communication or the MC's esteem has to be terrible for this type of situation to thrive. This situation also wouldn't change if FMC really was dating Takt and breaks up with him because MC finds himself another girl to date. FMC has to throw herself at MC for him to respond at all. Afterwards, MC leads us into this push and pull situation with his reasonings of "Don't test me", "I can't because of Takt", or "Her words doesn't mean what she tells him". Its possible that MC would not have made a move for a different reason if they weren't dating regardless because that's the type of low esteemed character that the author made him to be. Either way, hopefully the secret is worthwhile