Isshiki-san: Does a trial couple need to agree on when it ends?

The synopsis of the anime announced for January 2027 suggests that Isshiki and Rokutanda try a relationship to understand love. I'm interested in what would happen if one wanted to leave the experiment and the other needed more time. It's a possibility the premise suggests to me, not something I know happens in the work.

I would be convinced if they could stop without the story treating it as a betrayal. Even a scene where they agree on what they expect from that trial could lead to a nice comedy: setting very serious rules and discovering they don't feel the same way at the same time. Do you prefer a fictional couple to talk about those limits from the start, or to discover them when the conflict arises?