I just found a better ending for the series : r/TheDevilIsAPartTimer

Read The Devil Is a Part Timer Manga Online - [Latest Chapters]

Hataraku Maou-sama! (The Devil is a Part-Timer!)

Traditionally Trained -- Summer Wrap! by Let's Anime

Hataraku Maou-sama! (The Devil is a Part-Timer!)

31 TV Characters Who Deserved Better Endings

Read The Devil Is a Part Timer Manga Online - [Latest Chapters]

DO NOT OPEN if you don't know the LN ending. : r/TheDevilIsAPartTimer

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Hataraku Maou-sama! Wiki