Back cover of Back of Toilet-bound Hanako-kun volume four on a gray bedsheet.
Front cover of Back of Toilet-bound Hanako-kun volume four on a gray bedsheet.

It's Hanako volume 4

Back of Toilet-bound Hanako-kun volume three on a gray bedsheet.
Front cover of Back of Toilet-bound Hanako-kun volume three on a gray bedsheet.

It's Hanako volume 3

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Front facing open mouth monster treasure chest