Period: Cube ~Shackles of Amadeus~ Astrum Walkthrough Guide

Hello and welcome! I got my copy of Period: Cube ~Shackles of Amadeus~ recently. And today, I finished my first route which is Astrum, the leader of the Angel faction.

Astrum is a very competitive player in the world of Arcadia. He's known for being a role-player (RP) as what his fellow angel comrades describe him (and made them cringe most of the time *laughs*). He is the considered leader of the Angel faction inside the Arcadia and holds one of the powerful weapon or Trinity of Swords named Divine Blade of Light. In the real world, he's a geeky and oh-so-shy guy.

Let's get to know more about Astrum:
  • Real name: Toru Asou
  • IGN (In-game Name): Astrum
  • Age: 21 years old
  • CV: Sakurai Takahiro
Here are the other walkthrough guides of Period: Cube Characters:

Here are the choices I made that leads me to get his Happy Ending. Please do take note that I am blindly playing this game and this post will be updated from time to time as I will also try to get the other endings.

Happy Ending

Choices here will increase Astrum's affection level. **Game Choice = Kazuha's Almighty Level. To get Astrum's Happy Ending, we need to increase Kazuha's Almighty Level as well. To do this, we need to prevent choosing "Observe" at the Game Choice section once you start his route.

  • **Game Choice: Crouch Down
Quest One / Chapter One
  • Chapter One Part One
    • **Game Choice: Play Harp
  • Chapter One Part Two (Start of Astrum Route)
    • It wasn't him. It was my fault.
Quest Two / Chapter Two
  • I'm just a little embarrassed.
  • It'll actually make me more nervous.
Quest Three / Chapter Three
  • I'll do everything I can.
  • **Game Choice: Play Harp
  • I was thinking the same thing.
Quest Four / Chapter Four
  • Please, let me stay here.
  • **Game Choice: Use bow
  • I'm sorry, Toru.
Quest Five / Chapter Five
  • I can't help you.
  • **Game Choice: Increase ally strength
  • Astrum, Stop!
Quest Six / Chapter Six
  • You're not at fault.
  • Yes, I do.
  • Don't push yourself.
Quest Seven / Chapter Seven
  • I'll fight with you.
  • There will be a credit video that will play after you finished the route (Happy Ending - Astrum).

Bad Ending

You can't clear Astrum's route if your affection level is too low (like 10 out of 11 Affection level and below according to my own experience as I repeat his route). You can't also clear the game when Kazuha's (or your) Almighty Level is too low.

Just choose the other choice option when doing Astrum's route to get the bad ending. There will be a prompt saying "Game Over. Astrum's Affection Gauge is not enough."

Merry Bad Ending

To get Astrum's Merry Bad Ending, you need to satisfy the following condition:
  • Kazuha (or 'you') Almighty level to max (5 out of 5) AND;
  • Astrum's Affection level to 0 out of 11.
You can get this Merry Bad Ending by:
  • Going to Quest Seven of Astrum's route:
    • Title Screen > History > Astrum's Route > Chapter/Quest Seven > Select Kazuha's Affection Level to Max > Select Astrum's Affection Level to 0.
    • Select 'Repeat this Chapter.'
    • Select the answer: "Do we really have to fight?"
    • There will be a credit video that will play after you finished the route (Merry Bad Ending - Astrum).

*Changelog 5/2/2017 - Added Bad Ending Choices
*changelog 5/3/2015 - Added Merry Bad Ending


  1. I can't seem to reach the bad ending.
    How do I make sure Kazuha's almighty powers are very low?
    Thank you very much for all of those walkthroughs - they're great :D

  2. Hello! Thanks so much for using this guide!
    Which bad ending are you aiming at? If you're pertaining to the "bad ending" only:

    As for my experience, you can't get Kazuha's almighty powers to zero when you're playing the game. Because if you choose each 3rd option on her power options, you will be prompted to another choice. For example, if you choose "Stand by," you will be prompted to "Use bow / Use Harp" which will still increase her almighty power (as for what I noticed). You can get almighty powers but I think each time you choose 3rd option will prevent from getting 5/5.

    UNLESS, you'll set Kazuha's power to zero by playing Astrum's route on his last chapter thru "History" option (it will be possible if you got his Happy Ending already).

    I hope this helps :D