Digimon Data Squad Redux (rewrite)

A rewrite of my older story Digimon Data Squad Redux. What if, rather than the core DATS group being a team of 3, it was a team of 4 instead? How will the events of Data Squad be changed with the addition of a childhood friend of Yoshino's to the group? Read to find out! Explanations, pairings, and details in the first chapter! Rated M for some rough content in various chapters.