This volume includes chapters about: Sarah, Helena, Allison, Cosima, and Rachel. Each chapter ends with a slight mention of the next featured clone, and Rachel’s chapter ends with a mention of MK/Mika, so I’m guessing the next chapter/volume will start with her. Every chapter has a slightly different art style to match the personality/mood of each clone.
If you’re a fan of the series, I highly recommend this. but just don’t expect it to be a sequential story.
Each chapter is a self-contained standalone backstory for each character, all with the intention of helping you understand the nurture side of each clone’s life; which is something we don’t get to see a lot of in the show. (Spoilers for the show in each chapter are minimal.)