This is Volume 5 of the "old edition" of "1×1/2 - Ichi to Nibun no Ichi -" published at COMITIA from 2016 to 2020. It is a yuri manga themed around the romantic relationship between biological parents and their children. Please note that the content overlaps with the currently published new edition (the new edition, which includes additions and revisions to this story, is currently in production and being released periodically).