一昨計算

Proof of ownership of the X account @51pichipichi

The animation works published on this channel were created by the animator known as 「一昨計算」 (Issaku Keisann).
These works include collaborations with the composer higma(X: @pai_dareka) , such as the music video:

“スカイライン / SKYLINE”
Music: higma
Animation: 一昨計算

The X account @51pichipichi was originally used by the animator 「一昨計算」 to share these works from 2019 through 2025.
This account currently appears to be under the control of an unauthorized third party.
A copyright report regarding misattributed works posted from this account has already been accepted by X.

DMCA Case ID: LEGAL-2160505

This page is provided as public documentation confirming authorship of the works and the connection between the animator 「一昨計算」 and the X account @51pichipichi.
Official reference video:
https://www.youtube.com/watch?v=G7NU3KQ4fAw

Proof of authorship and account ownership (一昨計算 / @51pichipichi) 
https://www.youtube.com/watch?v=zh_CLU4DF84