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This is a short and sweet guide to the affection system used in the game.
It won't be in order of appearance and you need to know the game, to be able to use this guide.

First:
How to get the different girls to show up.

Hierophant always gives you Jei and Hyedong. Combined with courage it gives you Chaeng and Seola. Combined with freedom it gvies you Nuri and Yujeong.

Hermit always gives you Chaeng, Combined with freedom it gives you Nuri and Y.

World always gives you Seola.

Love always seems to give you Jei and Hyedong.
Courage always seems to give you Seola.
Freedom always seems to give you Nuri.
I need to verify these 3 statements.

Noiw how to use the guide.
Each section will cover 1 or two girls (depending on if their stories are interlinked).
You will only see the choice and how it affects your rating with that girl (and possibly others).
You need to know where these choices are.

Obvious stuff like choosing the girl you want to follow isn't listed. Sometimes the choices have different results based on your card.

As Kei is your host and involved in the entire story, I will start with her.

Generally be kind to her, if you want to obtain her ending.

Positive choices:
Help her out
A little
I came to visit you
I think so (if asked if you like Kei, is negative for all other girls)
I think I like her (same as above, same situation)
I could stop by to keep you company
I'm thankful for everything
I'm not a kid
Grab it
Kei's car
Change the subject
Stay with her for a bit
Yeah
It's a little boring without you here
Text her anyway

Negative choices:
No, definitely not
She's not my type
No

Positive choices for other girls:
I think so (depending on the girl that is your mentor)
Yeah (if asked about your love for a girl)

Negative choices for other girls:
I'm just doing it for myself (depending on the girl that is your mentor)
Nope (if asked about your love for a girl)

I like the style of Jei the most, so she is the next part.

Jei

Generally be a tease and stand up for yourself, but be honest and genuine, not too sappy and not jaded, either.

Positive Choices:
Snap back
Tease her
Sure
Ask Jei to join you
More side dishes
Hyedong makes me want to drink
Beer
Be a regular himan being and say hello
Tease her anyway
Yeah
Grab a drink and come back
Sure
Kei's car
Let it go
Help Jei

Negative Choices:
Respond calmly
Because I like you
I don't think love exists
There's always Gray

Hyedong

Generally grab live with both hands. Enjoy it and be silly.

Positive choices:
Ask for help
I couldn't have done this without Hyedong's help
Thank you sir
Bulgogi (marinated beef)
Stealth mode
Ask her about her photos
Grab a big plate of it
Stay with Hyedong
Sure
There are still fun things out there
Tell the truth
Joke with her
I like it
Yeah, it is a little exiting
We'll still find adventures. I'll be here
Another
Agree
Sometimes what you need isn't enough
Kei's car
Let it go
Accompany Hyedong

Negative choices:
I can't
We'll see
Yes
Let me handle it

Gaining affection with Hyori helps you later in Chaengs route.

Chaeng

Generally be witty, rebellious, genuine and don't ask about her family.

Positive choices:
Leave
Pretend to leave
Sit with Chaeng
A photorealsitic self-portrait
A comic book character
I just like being around you
Follow Chaeng
I'll help you
Pretend to leave
Sometimes the hero doesn't have a choice
What do you think of drama
Why, would you miss me
Go to her

Negative choices:
We should stick to our schedule
Agree
What's your faimily situation

Hyori

Generally be updstanding.

Positive choices:
Say hi
I'll be careful
Sit with Hyori
We should stick to our schedule
Ask for help

Negative choices:
Whatever

In general be friendly, open, social and honest.

Positive choices:
Say hi
Tell her to come out
How did you end up in this city
What are you reading
What are you studying at school
Maybe
Fine
Do you have any other plans today
Any close friends
Anyone you like
Who's that stalker the others joked about
It's true
We'll learn together
Greet her
Sounds fun
Sure
Confess feelings
Go for a kiss
Pasta
Nuri's car

Negative choices:
I wish reality was that interesting
Yeah, I was. Let me know next time
I don't want to hear about Z
No, I don't like him
No thanks

Yujeong

Generally be humorous, be assertive and trust in her.

Positive choices:
Sure
Ask for private lessons
Nah
Fine, I'll do it
I'm sure you can handle it
I love it. So much. (Sarcastically)
Ramen
Freedom
Go for a hug
Beer
Ask for Yujeong's song
I'll do it
Yujeong's car

Negative choices:
I just want to help
Money
Go for a kiss
I'll just leave

Yuri

Positive choices:
Go for a kiss
No
Go to class
I can play this song
What do you think

Having a good realtion to Jihyun can help you out here.

Seola

Generally be driven, never give up and win matches.

Positive choices:
Sure
Talk to Seola
Let's do it
Give 100%
Sure
Try to steal the ball
Drive it in yourself (only if you chose "the world")
Give her some space
Try anyway
What do you want in life
What made you so competitive
How did you meet Jihyun
Yes
No thanks
Seola's car

Negative choice:
No

Jihyun

Postive choices:
Play with Jihyun
Pass it to Jihyun
Talk to Jihyun

To be able to do Y's route you need to choose "Hermit" and "Freedom".

Generally give her space and be supportive.

Postive choices:
Say hello
Investigate
Be honest with her
Agree to help out
Visit her
Visit Y
It's an improvement
Stay silent
Ask less than 2 questions (during the date)
Are we friends
Tell her about the band competition
Yep
Let Y do it
Give her a goodnight hug

Negative choices:
Tell her to calm down