Level. 12 That was the Beginning of a Legend Revolving Around a Certain Island and Dragon

'level. 12: There Begins a Legend of an Island and a Dragon (それはある島と竜を巡る伝説の始まり Sore wa aru shima to ryū wo meguru densetsu no hajimari) is the twelfth volume of the Hai to Gensō no Grimgar' light novel series. Originally set to be released on December 25, 2017, its publication date was pushed for March 25, 2018 for unknown reasons; the title was only revealed in February.

Synopsis
'The east. The east. Towards the east――.'

Believing it is the fastest route leading to Alterna, Haruhiro and his party decide to head towards the sea. But first they must bypass the mountainous valleys of enemy territory. As difficult as the journey sounds to be, they must also care for Mary.

Overcoming a series of accidents, fear and distress, they finally chance upon a beach. And a grounded ship. Their encounter with the mysterious pirate Momohina leads Haruhiro and his comrades to the Emerald Islands.

But just when luck would have it, the land of pirates is under siege by a dragon!