It is most likely changed from 1.10 and on.
The spell looks like it is 7 range, just in Marisa's range (sitting there from Master Spark), so I can chain bomb from there.
Honestly though, you could just sit there against it; The Spell is on a timer. Capturing it is different, the problem is that Eirin has Guard L2, couple that with being 7 is a - Power, she also has 38,000 HP~ on Hard which is so hard to cheese. You would need Fury/Valor to deal damage, which is the kind of luxury you do not have cause running up there takes good planning for the WP. Also, time, getting up there to both bosses wastes turns, 1 turn on Reisen, and 2 turns for Eirin (getting there and wasting them). Let me tell you my plan that got up to Reisen in Turn 6.
- Carry Ran and Yuuka, their MAPs are clutch for the WP.
- Aya + Yukari combo, Yukari needs to use her "Spiriting Away" Unique Command.
- Turn 1, Mystia will cast Night Bird Song on Aya, giving her ample Evasion. She will be the target for EVERYTHING that is in range for the turn, this is required.
- Pack everyone else on the ship. Have Aya cast Accel/Super Accel on herself, go as far as possible, hit something, don't get hit, Quick Save the game.
- Aya needs to survive the onslaught, not required, but losing someone on turn 1 is just dumb imho. She should be okay since she is in focus movement.
- Turn 2, pack Mystia on the ship. Now switch from Aya to Yukari, now use Spirit Away and put the ship right next to you. Push everyone else out and waste them.
From then on, you have to move everyone closer to the Reisen every turn, otherwise you will not make it for the WP.
Eirin is just way too potent, in order to use less resources against her (on hard), you have to put her to near death on her non spell bar, then whack the rest (from her ability Regen) along with the half she regens from the event. By then, it was Turn 10, and I have 1 turn each to whack a 2 lifebars to win. I won on the last move, on the last turn.
Also, thing is, you do not want to use your range attackers since the most of them will leave permanently/ a long time and you want the charas that will go to the moon with you to get the PP and level ups , which you already know why I am over preparing.
EDIT: According to the Japanese Wiki, both Yorihime and Berserk Utsuho have been toned down significantly... to a point.
If you choose not to piss off Yorihime, her HP is not that to deal with at all... on Normal at least. Depending on how you answer in the beginning however, her HP boosts are completely changed instead of just the opening health bar. For your reference, if you choose to deal with Yorihime with her completely mad, she has 64,000 on her last bar on NORMAL, which pretty means, you don't capture this in time. Regardless, her HP is much more manageable now in reference to her abilities, I won't know until I deal with her though.
Berserk Utsuho, on the other hand, has become much more manageable on both ends, she used to have 40,000 HP on hard, which is just stupid with Guard L2, now it is a much more tame 30,000 HP, and a bit less than that in all her first 4 Spell phases. In contrast, now her Subterranean Sun has much more health now, it used to have 40,000 on hard, and now it has ~50,000. This final phase is now going to be a doozy considering she has L8 Potential on a 50,000 body. Oh yea, the attack now has a dynamic kill animation.