Davi's plan A was actually the traditional style. It was her first choice because she believed that she first needed to test the waters before jumping into it. After all, Sei was like freezing cold water, and jumping into him right away might result in nothing but suicide, or worse, she might fail hard even before she got the chance to execute her plans. She needed to proceed slowly, but surely, to get his attention first.
Basically, she had to court him; she wanted to court him and make him want her. She also thought that since those girls before her might have already tried their absolute best, then she had to try even harder. She was willing to try going back to the dark ages if that was what she needed to do. This was plan A, the mission she herself entitled; 'The legendary courting after marriage'.
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