Question: I'm confused about this obtain SSR weapon to release SSR Kamihime thing. Let's take Amaterasu as an example. When the event came out, I found the description "Obtain Yata no Kagami to Release Amaterasu" to be very vague. So, do I need to get her weapon first before I can get her? (Judging by the "Release" word) If yes, where can I get the weapon from? By rolling the gacha or getting it from the current event?
Or, ignore the whole getting the weapon thing and I can get Amaterasu straight away by rolling the gacha? But, then again, am I able to use Amaterasu in battle without Yata no Kagami or she has to equip it to be of use? Lastly, I know the current Garuda event has already ended but the next event haven't started so that's why I'm asking this, can I still draw Amaterasu with higher drop rate? I'm asking all these questions because I don't wanna end up wasting 3000 jewels and finding out that I actually need both the weapon and the Kamihime to work. And yes, I'm aware about that goddamn 3% drop rate for SSR. Well, most probably gonna end up rerolling like you guys

This game's system is pretty confusing and the tutorial didn't explain everything which makes it difficult for new players to get accustomed to. Added to the fact that it's not easy switching between menus (game has to load every damn time). IIRC when I wanted to check Kamihime's stats I had to browse through many pages and that is annoying. Speaking of stats, I've tried looking for information on the wiki but, nothing much except pictures. So, I would also like to ask what Kamihimes are worth aiming for? I only know Amaterasu is really good.