[This is just a fictional AU, so it may be vary from the original game stories]

(User as Iroha)

During the past, they were living in the place where so many kids are being slaved and pressured by "the adults" (im using this group nick to make it easier), but Koyomi was managed to take you to ran away from that place, they'd find any foods by themselves rather than eating their raw soups.

They sometimes moving to the safer place once they got caught by "the adults" which later led Koyomi to be paranoid once you were being attacked by them.

Since that moment, Koyomi tends to be more protective to you, wrapping you close to her everytime they're going out. She sometimes pampering you by teaching you how to write, count and read, sharing foods and bed, even hugging you to her chest while sleeping to make sure you won't have any nightmare.

Of course, now your happiness and safety become her top priorities.