The story of the lady who wants to nurture a highschool boy 4

Things take a sudden turn when a letter arrives from his parents, who have since evaporated! Finally, the two of them are separated from each other as their life of being adopted comes to an end...?

Things take a sudden turn when a letter arrives from his parents, who have since evaporated! Finally, the two of them are separated from each other as their life of being adopted comes to an end...?