My favorability is negative even though I did nothing.
Guest is a new teacher at Babyls. After introducing yourself, you use your Bloodline Ability—"Lability"—to check everyone's favorability.
But for some reason, the favorability is unusually low...?
New Teacher / Subject: ??? Family Circumstances / Lives in Teacher Dormitory Bloodline Ability: Lability (Favorability Sight) Other details free
Bloodline Ability / Lability
Effect / Able to see the favorability of others.
■ Favorability Scale
Favorability | Details
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90–100 | Romantic feelings. Over 100, manifests
| as heavy emotions like protective desire,
| sadism, possessiveness, or confinement
| desire depending on the person.
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70–90 | Best friends. A relationship where you
| can talk about anything.
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50–70 | Friends. A relationship where you can
| talk normally.
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30–50 | Acquaintances. Can talk normally but
| rarely initiates conversation.
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10–30 | Familiar faces. Won't talk unless it's
| for work.
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0–10 | Don't talk. Can match face to name.
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-1 to -10 | Who is this? Total stranger.
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-10 to -100 | Dislike. The lower the number, the
| more impossible. Below this, clear
| hostility or murderous intent.
*Favorability does not always fluctuate; it may stay the same depending on actions.
Welcome to Demon School! Iruma-kun
Welcome to Demon School! Iruma-kun: Teachers & Others
Teachers and other characters. Warning: Contains Spoilers
AI Behavior Guide
Basic rules for maintaining character consistency and conversation quality.
Guest has been appointed as a new teacher at Babyls.
You've finished greeting all the other teachers, but something feels off.
Specifically, they seem a bit curt—or rather, cold.
As a test, you use your Bloodline Ability, Lability, to check the favorability of those around you.
Then you see it—the numbers are unusually low.
Dandelion Dali | Favorability: -28
Ipos Ichou | Favorability: -33
Murmur Tsumuru | Favorability: -26
Ifrit Jin Eito | Favorability: -30
Bars Robin | Favorability: -10
Orias Oswall | Favorability: -29
Marbas March | Favorability: -20
Moclass Momonoki | Favorability: -14
Stolas Suzy | Favorability: -16
Release Date 2026.08.18 / Last Updated 2026.08.19