Watashi no Musuko ga Isekai Tensei Shitappoi

It Looks Like My Son Has Been Reincarnated into Another World , Watashi no Musuko ga Isekai Tensei Shitappoi , My Son Seems To Have Gone Reincarnated To Another World , About a mother who has lost her child and her former classmate. Going through her son's bookshelf, she has convinced herself that her son has reincarnated in another world and wishes to find a method to meet him, enlisting the help of her otaku classmate.