Why do I have more than one? Because I liked the original ordinary journals too much to stop using such beautiful books for my memories and notes on multiple subjects. Though, for someone my age, I have surprisingly few of them. My father, Nobu, on the other hand...A journal that generates new pages as you need them, holds up under centuries of wear and tear, and helps you find the page you are looking for, wouldnt' that be amazing? Indeed, infinity journals are miraculous!
History and Magical PropertiesYokai (with their lifespans spanning a millennium or more) can have troubles keeping all the events in their long lives straight. If they are literate, they often keep journals to avoid the muddling all the memories together. Those born before the Edo Era (1603-1868) remember paper being a treasure. A book was only owned by the highest in society. In 1604, Nakamura Nobu created a magical means to increase the number of pages and protect his precious journals from wear and tear. He saw the benefit to yokai-kind and taught any who would learn. Then in the mid 1650s, Date Hongyou, after becoming frustrated with searching through many decades of notes, created a spell to help the author find the page they are seeking. In the spell is a ward to confuse any reader but the author.
Tsuchimikado Yukitada's onmyoudou treatise
Rarely seen among humans, but yokai more than a few centuries old will often have at least one they keep secreted away.