Here is the special edition of the cover of volume 18 with a change from blue to red which reminds the previous cover. From what I understood this edition will come with
Why can't we get Bell x Ais interactions like this in the main series?? [SO manga quest 98] : r/DanMachi
Light novel readers waiting for volume 18 : r/DanMachi
For people who keep asking when Volume 18 will be translated in english. : r/DanMachi