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Rimuru And Iruma's Adventures In The Netherworld » by Mu1622
A bored Rimuru Tempest accompanies Diablo when he goes to meet with an old friend in the Netherworld. What will happen when he meets an out-of-place human boy who piques his interest?Tensei Shitara Slime Datta Ken/転生したらスライムだった件 & Welcome to Demon School! Iruma-kun/魔入りました！入間くん, T, English, Humor & Friendship, chapters: 116, words: 767k+, favs: 1k+, follows: 1k+, updated: 9/29 published: 6/28/2021, Rimuru T., Iruma S.
490The Great One's Journey » by The Liar Who Lies
After eons of ruling and watching over Tempest, Rimuru decides to retire. He goes on a journey with Ciel by his side. What will he encounter? Who will he meet? What new bonds will he forge? Maybe he could even reforge old ones? Who knows? Adventure awaits. (Cross-posted in AO3 and Wattpad under the same name)Tensei Shitara Slime Datta Ken/転生したらスライムだった件, T, English, Adventure & Fantasy, chapters: 48, words: 98k+, favs: 813, follows: 861, updated: 12/20/2022 published: 3/14/2021, Rimuru T., Ciel