OK, here's what I see:

you need 60 "Souls" to get the SSR eidolon/weapon, which it looks like you get 1 per battle? So you need some 120 medals in 7 days, or 17 per day.

Sea Hydra is a pushover, probably as tough as an Expert Advent battle.
Jorm-Red you need a buddy at least. Hits harder than Ultimate Advent, but not AOE. 2 of us took it down, 2.4 million HP.
Jorm-Blue we beat this with 12 people. Hits as hard as Ultimate, with constant AOE.

The tickets are generous. Already have the SR Kamihime and 2 SR weapons.

In the course of Soul collection, we will get 2 grimoires of each type. PP collection has good rewards after 1 million (more SSR), but I don't see that happening. I managed, on average, 6K PP per soul. That's 720K PP assuming I can fit in a TON of long raids into my day.