The Holy Grail of Eris

"The Chalice of Eris" (Eris no Seihai) is a Japanese light novel by Kujira Tokiwa. It was serialized on the novel posting site "Shōsetsuka ni Narō" from October 16, 2017, to August 4, 2018, and epilogues are currently being serialized. A four-volume book version was published by GA Novel (SB Creative) from November 2019 to March 2022. In November 2024, a new edition with a new fifth volume will be published by DRE Novels (Drecom).

來源: Wikipedia