Either type of Ys is fine.
If you want to fill in the memories yourself, choose "I want to take it easy."
At first, it's a good idea to save frequently to see the contents of all the options.
If you proceed to the end while choosing all the options, you will usually reach the normal ending.
The text color of the option you chose will change, so it's easy to tell.
At this stage, Another Story on the title screen and some Omakes will be unlocked.
Normal End: Choose not to resist temptations
True End: Choose to resist all temptations
Steps to get to the TRUE ending (skip prologue)
"Nod"
"Endure"
"Wait for the other person to make a move"
"Leave this place"
"Keep moving"
"Reject"
"Refuse"
"Go to sleep"
"It can't be good" "
I can't give up"
"Use it for my comrades"
"Make up your mind" "
I want to fight"
"Who will go"
"Don't be fooled"
"Sorry"
"I don't want to put it out" x2
"Look at Catratna"
"Don't have sex"
"I can't marry you"
"Can't decide" "
It's an unwanted proposal"
"Refuse"← Save 1
"Refuse"
"I want to live
"Say thank you"
"I'm not going to sleep"
"Get moving, me"
"I mean get moving"
"Make a move!"
"Deny"
"It's nothing"
"Nadi"
"Wait"
"Catatna"
"I don't want to get in
Travel around the elf village"
"Don't lay hands on me"
"Live in reality"
"I won't let her be alone"
If you see the TRUE END, the Nadi route will be unlocked