You know, logically speaking the agreement to go out with Soramori does not preclude the option of breaking up with her afterwards.
... Bets on how long it will take Takebe to realize that? I say she'll either do so early on yet never gets finds a "proper" time to do it and ends up falling for Soramori by the time she finally does find an opportunity, or she only has the realization after she falls in love.