It started getting updated since june 2024 https://zetrotranslation.com/novel/my-yandere-girlfriend-hiding-in-the-dungeon-kills-me-over-and-over-again.
p.s. for everyone: it's worth to read, and Agatha's position is entirely expained in ch.133-134
the function on the t-shirt is ok to exist in complex system, the result is x^2*y^2=-1
then x=±1, y=±1i (where i stands for imaginary part and eqls √(-1)
nvm I got what you were talking about, I didnt even think about relation between formula and the curve.