Tensei Shitara Slime Datta Ken: Bangai-hen - Toaru Kyuuka no Sugoshikata

Sinopse

Rimuru and his friends go to the "Magic Tower", a place where magic from all over the world gathers to develop new special moves, and they are supposed to be busy with their research, but they get caught up in a conflict...<br><br> (Source: Official Website, translated)<br><br> <i>Note: Includes one extra chapter.</i>