Kevin & Kell comic not working anymore

[Futeko]

The "Kevin & Kell" comic does not seem to work anymore on my device - as soon as I open it, I get the "Failed to load Comic" screen and all buttons are greyed out, except the "Browsing history" one.

I am able to display the browsing history, but selecting any comic from the list does not work.

If I try the "View in browser" button, it immediately fails with "Error: Failed to open comic url in browser. Did this comic load successfully?".
And using the "Share link" button crashes the app.

Based on my history, the comic worked at least until the 24/05/2024.

My device is a Samsung Galaxy S8 on Android version 9, One UI version 1.0