This walkthrough will be separated into two parts: 

• A/Explanation of counters and 
• B/Endings walkthrough.

A/Counters:

The way the branching in this VN is done depends on different stats accumulated through choices, mostly gained at the beginning in the first two scenes (intro chase & entrance hall). The consequences of these choices isn't immediate but will heavily impact the ending. 

1/Fight points with friend:

Depending on whether you are mean/blame Sophie for the zombie chase at the beginning or not, this determines whether Sophie will side with you or not, in the eventuality she survives until the end. 

2/Keep weapon or give it to friend:

A selfish VS selfless choice. When Sophie asks for your bag & bat, you can choose to give them to her or not. 

This determines whether the one who goes to the toilets survives the fight or not (and reappears later in the story). To win the toilet fight, they have to keep the weapon on them.

3/Zombie fight in museum tour route:

Depending on the way you survive this, this determines whether curator has to exhaust his ammunition fighting zombies or not. If yes, that means his gun is almost empty by the end of the tour. 

4/Esteem points from curator in museum tour route:

To get them, be nice and thankful to curator, show interest in the exhibition, ask questions to get more infos. Don't be suspicious and don't ask dumb or prying/annoying questions about him or the museum. 

The rest of the choice options not mentioned here give negative points.

5/Quiz points in museum tour route:

Accumulate quiz points by answering the curator's questions correctly. This determines whether curator considers you the brawl or brain type. 

B/ Endings walkthrough:

Ending 1: Still toilet waters run deep

• Skip the museum tour: choose "Hmm, that's very nice of you… but"

Ending 2: Nothing is lost, nothing is gained, all is transformed

• "Go to the bathroom first"
• Fail the fight:
  • Auto fail in various ways if you don't have the bat on you
  • even if you have the bat on you, you can still fail in various ways if you make the wrong choices.

Ending 3: Zombie bite

• Precondition for both routes: Keep bat
• Toilets route: After "Go to the bathroom first" + choosing to come back to save Sophie:
  • choose "Fight" + "Attack their hearts" 
  • or choose "Flee" when zombie appears.
• OR Museum tour route: After "Yeah, you're dirtier than me anyway. You can go first, I can wait.":
  • choose "Fight" + "Attack their hearts" 
  • or choose "Flinch" when zombie appears.

Ending 4: Anatomy specimen

• Precondition for both routes: Keep bat
• Toilets route: (After "Go to the bathroom first" + Come back for Sophie)
  • "I raise my bat." + fight points with Sophie >=2

• OR Museum tour route: (After "Yeah, you're dirtier than me anyway. You can go first, I can wait.")
  • Disagree: "Humanity is beautiful, for the most part."

Ending 5: Alone on the road

3 variants on this ending:

1/Selfish variant:

• Toilets route + Keep bat +  Escape alone: 
  • "Slide the door's crossbar away"

2/ Alone against everyone variant:

• Toilets route + Keep bat + Come back for Sophie:
  • "I'm already diving away" if fight_route >=2

3/ Heartfelt variant:

• Toilets route + Keep bat + Come back for Sophie:
  • "I lunge at him."
  • or "I raise my bat." if fight_route <2

• OR Museum tour route + Give bat:
  • Disagree "Humanity is beautiful, for the most part." 
  • + "Flee"

Ending 6: Noble sacrifice

• Museum tour route + Give bat:
  • Zombie fight: "Fight" or ["Flee" + "Grab curator's hand"] => Curator has full bullets
  • + Disagree "Humanity is beautiful, for the most part." 
  • + "Fight"

Ending 7: Together we are fearless

• Museum tour route + Give bat:
  • Zombie fight: "Flee" + ("Bolt for the next room" or "Guarantee your survival") => Curator has empty bullets
  • + Disagree "Humanity is beautiful, for the most part." 
  • + "Fight"

Ending 8: A new day at work (Curator's romance route)

This route has very specific requirements to get it, the final choice option only appears if quiz & esteem points garnered during the tour are high enough. 

• Museum tour route:
  • Zombie fight: "Flee" + "Grab curator's hand"
  • Agree "I think we deserve it, sometimes. I think we deserve to be killed off."
  • "Will you stay here with me?" => "Convince me." 
    • => this choice option only appears if you have 6/8 correct quiz answers + have >=2 esteem points!
  • "Brain #Error404"
  • "Brain #Error404" (yes, choose this option twice)

Ending 9: Warm welcome to put balm into the soul

• Museum tour route:
  • Agree "I think we deserve it, sometimes. I think we deserve to be killed off."

Hope this guide was useful!