•the Igarashi and the Minato are family friends, Ushio and Yukimi were friends so the kids grew up together, before one of the families moved away (haven’t decided which one yet) and they started meeting less frequently. Ikki and Isami were best friends (people usually do Katsumi and Ikki bc they’re both the eldest but if you do the math Isami and Ikki are the same age so)
•Ikki’s memory loss post-revice (before he recovered his memories) is slightly different from canon: he can’t remember most of the year as Kamen Rider, not just Vice. He has only vague fuzzy memories. People can tell him what happened but it will not stick for long and he’ll soon forget
•for Genie Wish Rules, when Ace made the wish to give back Ikki’s memories, he wasn’t specific enough with the phrasing so now Ikki is basically immune to memory alterations of any kind (Asahi’s reality warping included, ence this comic). He remembers better if he’s fighting/doing physical exercise