Season 1
Episode 1:
Lines and Walls
Episode 2:
Locksmith
Episode 3:
3+(←)1
Episode 4:
Impenetrable
Episode 5:
Change
Episode 6:
New Semester
Episode 7:
Loneliness and Solitude
Episode 8:
On Equal Footing
Episode 9:
Self-Awareness
Episode 10:
Spring
Episode 11:
Inversion
Episode 12:
Thunder
Episode 13:
Perception
Episode 14:
Bombshell
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The Ramparts of Ice
Overview:
Weighed down by memories she can't shake, high schooler Koyuki Hikawa keeps everyone at arm's length — until three schoolmates draw her out of her shell.
First Air Date: 2026-04-02
Genre:
Seasons: 2
Episodes: 15
Episode Duration: 24 min
Status: Returning Series
Production: Studio KAI
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