English Walkthrough:
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Makina
---
Help Sachi
Mr. Standoffish Man
Help Sachi
** SAVE 01 **
Accept the money
** SAVE 02 **
Pull the trigger
? Makina BAD End ?

** LOAD SAVE 02 **
Don’t pull the trigger
? Makina End ?

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Amane
---
** LOAD SAVE 01 **
Reject the money
** SAVE 03 **
This calls for shock and awe. Steal a kiss with overbearing force.
** SAVE 04 **
Run away separately
? Amane BAD End ?

** LOAD SAVE 04 **
Run away with Amane
? Amane End ?

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Sachi
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** LOAD SAVE 03 **
This is idiotic. Can’t let myself get caught up in her nonsense.
** SAVE 05 **
Praise Sachi
** SAVE 06 **
自分を殺すしかない
? Sachi BAD End ?

(It seems they forgot to translate those two choices,
if this get fixed in a future patch and I haven’t fixed the walkthrough:
BAD End -> Kill self, Normal End -> Kill her)

** LOAD SAVE 06 **
母親を殺すしかない
? Sachi End ?

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Michiru
---
** LOAD SAVE 05 **
Ask for an alternate penalty
** SAVE 07 **
I want to ask you something.
** SAVE 08 **
Don’t leave after all. Let’s stay together.
? Michiru BAD End ?

** LOAD SAVE 08 **
How about a kiss before you go?
? Michiru End ?

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Sakaki
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** LOAD SAVE 07 **
No, it’s nothing.
** SAVE 08 **
Rune away together
? Sakaki BAD End ?

** LOAD SAVE 08 **
Confront him together
? Sakaki End ?