In light of the Fantasy Maiden Wars Announcement, here's a Changelog of what Updates to expect compared to Complete Box.
Since the Release is a Port of the 2022 Switch Version, just for fun, I did some digging on what Changes that Version has over the original Complete Box, since I know they adjusted some things and figured some people might care about it; although for the record, I'll leave out some minor stuff like "Characters now visibly float on the Map when Airborne", so this isn't the *entire* List of changes. And for those who haven't played the Game before, SOME SPOILERS INCOMING, OBVIOUSLY:
* Eiki's "Judge of Paradise" Personal Skill (For the Unit's next Battle, Hit Chances \>50% are set 100%, and Chances \<50% are set to 0% for both Sides) is now a permanent Command she has access to. The Personal Skill Version still exists, but now gives her a Map-Wide Version of it instead.
* Eiki's "Trial of Black and White" Personal Skill (Unit's next Attack does a guaranteed 5000 Damage, blocked by Special Resistance) changed to "When above 120 Power, Base Damage of the Unit's and Opponent's highest Attack Power Weapon is set to 3000 / 4000 / 5000 if below that Value". Value increases as the Skill levels up, and also affects both Units in a Pair.
* Eiki's "Pay Attention!" Personal Skill (Every Ally other than Eiki herself starts with +7 Power) buffed from +7 to +10.
* Rinnosuke's "Inventory Management" Personal Skill (Can use any Equippable Part that can be used mid-battle and is not currently equipped on someone) was entirely removed and replaced with the "Recovery Anchor" Personal Skill: "increase the Range of Palanquin's Ship's "Rescue" Command by +6 / +7", Range increases as the Skill levels up.
* Watatsuki no Toyohime's "Lunar Peach" Personal Skill (Recover 50 SP for both Units in Toyohime's Pair once per Stage) can now level up to increase the Recovery to 75, and then 100 SP
* "Chain Attack" Spirit Command (If next Attack shoots down an Enemy, gain another Action, only usable once per Turn) no longer triggers if the Finishing Blow was a Support Attack.
* Friendship Boosts now check for Diagonal Spaces aswell, instead of directly adjacent ones only.
* "Mystic Memory" Equippable Part (Reduce all SP Costs by 20%) no longer stacks with itself.
* Units that temporarily leave the Roster can no longer be Upgraded on the Intermission right before the Stage where they return.
* All "Can can only be used while in X State" Attack Restrictions removed. Ie Marisa's Master Spark is no longer Focus-Mode only, for example.
* Getting a Kill with a Map-Attack no longer makes you miss Bomb / Equip-Part Drops from Enemies that have any.
* Characters can now Support Attack on Combination Attacks they personally participate in.
* Murasa, Ichirin and Akyuu (if unlocked) can now be deployed on Stages 60 + 61 during New Game+ (regular NG aswell for Akyuu), even if not chosen as your Dream Mode Characters.
* Meiling's "Colorful Light Lotus Flower Palm" and the Aki Sister's "Super Aki Sister Kick Kai" are now properly learned at the start of Stage 65 (IIRC there used to be a Bug where sometimes those Moves fail to show up until after the Stage)
* generic Kedama and Evil Eye Enemies have their Dialogue removed for legal reasons (as a lot of their Dialogue was Shout-Outs / Parodies of other Works)
* Some Save-Skits got removed, probably for the same reason.
* Everyone except Nitori got their Dialogue removed for Hisoutensoku's Rocket Knuckle. Again, legal reasons.
* You no longer name your Team during Stage 71. As a result, even more Shout-Outs got axed that way - The Game had custom text to reject certain Names if you tried naming your Crew after existing Mecha Factions like Zeta Gundam's AEUG, Great Mazinger's Mykene Empire, or even SRW's Ze Balmary Empire (though it does relent if you try the same name three times)
* Can set more BGMs as Character Themes now (though one of Nitori's Event BGMs got removed from the selection), aswell as from more places than just mid-battle.
* Reimu's Upgraded Form NG+ Bug of randomly resetting to her Pre-Stage 42 State got fixed.
* The Bug that caused Cirno and Daiyousei to keep their Lategame Attacks even if not chosen for NG+ was fixed.
* Meeko no longer loses her Final B Upgrades if you ever do Final A again after unlocking them.