You will get a note telling you to explore a room, since 'that person' is away at the moment. You will get a choice of places to go investigate with Alice. Investigate The Laboratory so that you find The Monitor Room.
You need to upgrade Jack's Mary Gun three times as one condition for the Good Ending. You do this by finding parts for it and bringing them to Haru back at base.
You can find the first motor part from Chapter 4 onward, in the Old Shopping District, Area 4, at (X:06 Y:38)
The second motor part can be found from Chapter 5 onward, in the School District, Area 2, at (X:31 Y:07)
The third motor part can be found from Chapter 7 onward, in the Old Train Station, Area 1, at (X:14 Y:33)
An Optional, But Recommended Detour After Completing the Mary Gun
There is a hidden character that you can recruit once you have the fully upgraded Mary Gun Reverser. She is not technically required for the Good Ending (there are two versions, one with her and one without her), but she's a fun character and you don't want to miss out on her, do you? If you're a stickler for unlocking all CGs though, you might want to make a save before recruiting her so that you can get the ending CG without her in it, as well.
Go back to the very first dungeon in the game with the Mary Gun Reverser. In Area 2 at the bottom-right of the map, there is a ravine four spaces long (in other words, too far for Gretel's bread crumbs to reach across). Point away from the ravine and fire Jack's Mary Gun Reverser to fling yourself back far enough to cross it, and head downstairs.
Boss Fight: Hameln
On 'Fear' difficulty, she hits like a truck, and multiple times in a row. Forget about tanking her with Paladin's cover/guard, most of her attacks are party-wide. Not much to say except stack up that def/res and speed, level up and buff up your gear, debuff the hell out of her, bring tons and tons of revival and healing items. After defeating her, Hameln will join your party - she's a mage like Thumbelina.
BIG SPOILERS BIG SPOILERS BIG SPOILERS
Chapter 9 Dialogue Selections
At the top of the tower, there will be an investigating series of questions and choices to make. Failing a single one of these will lead to the bad end. Make a save before this point so that you can see both the bad ending and the good ending, and also so that you can change up your individual character endings. If you've done all that, you can stop reading until you reach floor 11 before reading further.
The dialogue choices begin with everyone meeting up at the top.
(The XXXXXX is...)
- Within Daybreak <-- Correct
- Within the Church of the Sun
(The XXXXXX is...)
- Professor <-- Correct
(The item that proves it is...)
- The memo with a drawing of a magnolia leaf on it. <-- Select this item from your inventory
(The place in question is...)
- Jack's room.
- The laboratory.
- The monitor room. <-- Correct
- The weapon shop.
- The Church of the Sun
If you got this far and have the Mary Gun fully upgraded, good job, you're on the way to a Good End with a Character End of your choice as well.
After beating the final boss, Jack will have an opportunity to use one special ability. Use the Mary Gun Reverser that you unlock when Mary Gun reaches Lv.3. To be clear, do NOT fire the Mary Gun Lv.3, use the separate Mary Gun Reverser ability.
Along with your Good End, you'll also get one character ending. The conditions for which character ending you get were quite confusing and at the time of writing this guide, none of the Japanese wikis have it written quite correctly. I painstakingly tested the conditions to confirm them myself, please read carefully.
First, you need full affection with the character whose ending you want. That means full hearts if you check their condition in Jack's room. However, that alone is not enough. You also need to see all of their character events. Usually that means following their events until you get the lewd CG event for a particular character. Even if you have full affection, sometimes their events only trigger in certain dungeons at certain areas, so you might mistakenly think you're prepared for their ending when you aren't.
Second, in the event you have multiple characters that fulfill the above requirements (and you most likely will), priority goes to the character at the highest slot in your party. A lot of people end up getting Alice's ending just because they never removed her from the first slot. How it works is that the game will go through your party slots in order from top to bottom, 1 to 5, and check: 'Have all of this character's events been unlocked and seen?'. If character 1 doesn't fit those criteria, it'll check character 2...so on and so forth, until it finds one that does. So just change your party formation and put the character whose ending you want at the top of your party.
I recommend saving in many different slots at the following spots:
- Before recruiting Hameln (only if you care about collecting all CGs, the Hameln-less ending version is not required for platinum)
- Before being questioned at the 11F of the tower, in two different slots. One where you answer correctly (for reloading for Good End + different character endings), and one where you answer incorrectly.
Of all characters, Hameln is the one most likely to reach max affection without you finding all her events, since she joins so late. If you want her ending (or any other girl's ending) but can't seem to progress their events even at max affection, go dungeon exploring and look for dialogue events on the map. For example, Hameln has one in the Old Train Station, Area 3, at (X: 23 Y: 03) and a second one after it at the tower, Area 3, (X: 21 Y:18).
That's it for today. I hope this guide is helpful for people playing the game in English, and if the wording is different in the localized version for any of the dialogue choices, please feel free to let me know in the comments so I can update it.