In an alternate reality, contact with Zero Two's blood causes Hiro to undergo a genetic mutation at a far younger age, although with his unique biology, it varies from hers in a way none could have guessed. Spurred by the change and unable to remember why, it alters Hiro's personality and thought process as he grows, unable to pilot. Then, he meets Zero Two and it all goes sideways
DARLING in the FRANKXX/ダーリン イン ザ フランキス - Rated: T - English - Adventure/Romance - Chapters: 18 - Words: 61,473 - Reviews: 81 - Favs: 98 - Follows: 92 - Updated: 4/10 - Published: 1/19 - Hiro, Zero Two - Complete