She finally acknowledge the death of her son, but still decided it was too much for her, and tried to jump of the bridge at the last ditch effort for her to Isekai. But the main character came at the momment to stop her, and he himself along with her put a stop to her fantasy, and accept the death of her son.
Then we get a timeskip 2 years later, as both characters part ways, keeping the promise to keep living life. MC got well on his business and we get to see him got along with the female main's friend group.
Final chapter is the reunion of the female and male main character, saying how they have move on with their life. They still keep the habit of reading Isekai light novel, as a statement of though this is just a fantasy, it is still derived from reality's desire and hope. The end