In each memory there will be choices, picking the right ones will unlock the good endings. I’d recommend first to try without this guide, since you can always replay the game in VN Mode. On the other hand, unlocking the good ending is a pre-requisite to do the final battles against Mantras, so I suppose could be useful to avoid replaying all the card battles in the game
Ace’s Memories
Spoiler:
1) "Stops hitting the guy and helps him get up"
2) "I was a winner"
3) "I gave him food"
4) "I sent her away"
5) "... make Xavier pay."
Lily’s Memories
Spoiler:
1) "A sensual dance"
2) "She asks the guard to help the poor man"
3) "Speaks her mind"
4) "I break up with Bryan"
5) "I realized I had nothing to lose"
Alpha’s Memories
Spoiler:
1) "That outbreak is concerning."
2) "So, family comes first as long as it’s your family?"
3) "You may have been a good doctor, but you were a careless dad."
4) "Side with Alpha"
5) "There were millions of lives at stake."
Angel’s Memories
Spoiler:
1) "I can’t imagine going through that"
2) "So, that’s why you were captured."
3) "You were smart to use his feelings against him"
4) "You shouldn’t feel guilty."
5) "I’m here and I’ll fight for you."
Aquaria’s Memories
Spoiler:
1) "Appeal to friendship"
2) "You never know what's going to happen next"
3) "The island was the afterlife!"
4) "They were just superstitious"
5) "Something doesn't add up"
Kraken’s Memories
Spoiler:
1) "That was sad"
2) "What happened between you and them?"
3) "You were ruthless."
4) "Your ship's crew was made up of all races"
5) "Did you have a change of heart?"
Ash’s Memories
Spoiler:
1) "You were a jerk!"
2) "Poor Eliza."
3) "Try to comfort him"
4) "You didn’t even try?"
5) "You loved your music more than your sister!"
Magma’s Memories
Spoiler:
1) "There are no rules."
2) "Why don’t you ever see yourself killing?"
3) "Talk about her bond with Aures"
4) "You shouldn’t have waited."
5) "Trust your wit, Mags."
Cyberia’s Memories
Spoiler:
1) "I think they made the right call"
2) "Praise the AI"
3) "It was the only way"
4) "Emphatize with Dr. Fox"
5) "Try to comfort her"
Mercurio’s Memories
Spoiler:
1) "Comfort him"
2) "That was the wrong conclusion"
3) "You wasted your life"
4) "I let him destroy his room."
5) "Focus on the pilot's apology"
Gambaron’s Memories
Spoiler:
1) "Imagine being in the puma’s shoes."
2) "Talk about the puma"
3) "Trying to negotiate with them is pointless."
4) "The only way is to kill them all"
5) "Now all makes sense"
Iszeria’s Memories
Spoiler:
1) "It's not a happy tale"
2) "I am worried about you"
3) "Try to cheer her up"
4) "Hug her"
5) "I don't know..."
I'm also considering, maybe in Easy mode only, to have a heart icon or something near the right answer. It kind of defeat the purpose of having a choice (if you know already which one is the right one ) but if some players just want to see the happy ending, or perhaps after replaying the game for the 10th time to get the good ending / extra battles... then makes sense.
Still thinking if to tie to a difficulty level or maybe have it as option (if I can fit it in the options screen), or simply offer the choice when the memories begin. Let me know if you think is a good idea or not.
I didn't think it mattered, because you didn't have the usual relationship meters, so I picked options I thought would be funny, and absolutely not the "right" ones.