Otouto !new!: @notificación.:name:hito No

I just got a notification I can't explain.

Check your notifications. Scroll all the way down. @notificación.:name:hito no otouto

Has anyone else seen this? Is this a creepypasta I forgot I started? A glitch in iOS/Android? Or did someone just try to assign me a sibling I never asked for? I just got a notification I can't explain