Both this and the main series need to speed up (sarcastically). If they continue catching up to the light novels at this pace, I'm gonna die from an overdose of sugar in my 60s, 30 years from now, and not even get to see the end.
Japanese are weird. Still buying journals in 21st centrury. When you can just download things on your phone, or even better if you have a laptop.
Also, if he buys a journal after 18, he will surely read it together with her