Stopped at ch 10 — 1.) Tensei Shitara Slime Datta Ken (main story) — 2.) tensei shitara slime datta ken: the ways of strolling in the demon country (1st spinoff) — 3.) Tensura Nikki Tensei Shitara Slime Datta Ken (side story) — 4.) Tensei Shite mo Shashikudatta Kudan (2nd spinoff) ← reading this — 5.) Tenchura! Tensei Shitara Slime Datta Ken (3rd spinoff) — 6.) Tensei Shitara Slime Datta Ken Ibun ~Makoku Gurashi no Trinity~ (4th spinoff, latest)
tensei shitara slime datta ken: the ways of strolling in the demon country