Tensei shitara Slime Datta Ken: Kanwa - Veldora Nikki  

That Time I Got Reincarnated as a Slime: Tales - Veldora's Journal, 転生したらスライムだった件 閑話: ヴェルドラ日記

In a conversation between Ifrit and Veldora during a game of Shogi, Ifrit discusses past events that have occurred since being trapped in Rimuru due to its Predator skill.