Dimensionality Reduction Strike

A failed dimension-enhancement experiment was half successful due to the interference of some kind of force. What will happen to a cautious young man who returns to Earth from a high-dimensional world with dimensional energy? Is there any chance to resolve the misunderstanding caused by my unintentional words? Can the late apology be sent to her who doesn't know which dimension she has wandered into? Can the traveler from another world who accidentally opens the dimension travel find the key to travel through the dimension? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.