It starts out kind of formulaic but when the story really gets going and the history and main antagonist is defined it breaks out of that mold.>I'm afraid to say I wasn't convinced by the busty girl with super strength wearing bondage gear exclusively and who is introduced *and* plot deviced into following the protagonist in the span of one chapter.
So I take you think it was paced too fast.
Well I assume the idea was to get the main introductions out of the way. As a monthly manga with fairly large chapters it can afford to pace like that. If it's any consolation it does slow down with the larger story arcs.
Her motive was developed adequately from the start of the chapter to the finish.