To uncover the truth behind their mother's death, Migi and Dali finally begin to take serious action.

Their clue is the memory of the room they lived in with their mother when they were young. They remember the dimly lit space under the bed and the wallpaper patterned wih daphnia.

In order to locate the room, the twins come up with a plan to be invited over as friends to different houses.

They promptly join the Boy Scouts to make friends, but the scouts offer their friendship on one condition.