This post is the walkthrough for the game, in case anyone needs it.

There are five endings in this game. Three of them are considered as bad endings.
Bad endings: Lost, Escape, Last Option.

The first two choices are just warming up. You can choose anything. They won't affect the game.

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BAD ENDINGS:

END: LOST

Choose to leave despite still being hurt.

END: ESCAPE

Set the trap and then later choose to escape.

END: LAST OPTION

Missing even one of the watering sessions will result in this ending.

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NOT BAD ENDINGS:

(To get the following endings, you have to water the flower every single time and choose to stay.)

END: BLACK

• Any
• Any
• Stay
• Of course no
• Think nothing of it
• They don't exist
• Don't do it/Do it   (any)
• Black rose
• Stay (if you previously choose 'do it')

END: PURPLE

• Any
• Any
• Stay
• Yes, reluctantly
• Thank him
• It will be great if they exist"
• Don't do it/Do it  (any)
• Violet
• Stay (if you previously choose 'do it')