While trying to create a place in society for her autistic son, Hikaru, has been an uphill battle, Sachiko Azuma has long known that perhaps the toughest place to find acceptance for him is within her own family. Despite some progress made, Sachiko's mother-in-law still treats her grandson as a nuisance and sees him in many ways as inferior to his little sister, Kanon. Now that the Azuma family has moved into Masato's childhood home, Sachiko must not only adapt to life with her mother-in-law - she also must help Hikaru, whose developmental disabilities make it notoriously difficult for him to accept changes to his routine, adapt to this new living situation and a new school. As Sachiko tries to balance caring for Kanon and Hikaru in the face of her mother-in-law's constant disapproval, will the Azuma family emerge from what seems like the darkest of tunnels into the light?

Told in completed chapters as well as unfinished pages that the creator drew while battling a long illness, this final volume of With the Light serves as a legacy to the late Keiko Tobe's inspiring dedication to bring to light the hardships and joys of raising an autistic child for readers around the world.