I Can Only Cross Halfway

Synopsis: Is time-travel a stroke of luck? Hard to say. But what if one could repeatedly travel to past worlds? Hmm? Isn't that a dimension rebirth? This should be a good thing! But... what if one could only cross halfway? Hmm... This is a serious question. This is a heartwarming everyday story of rebirth, compensating for past regrets, and changing the present and future.