Level. 15 A Fleeting New Game Plus

'level. 15 ' (強くて儚きニューゲーム, Tsuyokute hakanaki nyūgēmu) is the continuation of level. 14++.

It's the fifteenth volume of Hai to Gensō no Grimgar light novel series despite being the seventeenth published book.

Synopsis
"I really don't know anything ..." When he awoke, Haruhiro and the others were in the dark and everyone could only remember their names. The only person they can count on was Merry, who hadn't lost her memory.

When they managed to get out of the darkness, they discover that Alterna had fallen.

In search of information, Haruhiro leaves the city, using the skills and abilities that have been soaked in his body to stay alive while exploring the now hostile frontier.

When finally, he comes in contact with someone, it's the kingdom of Alabakia coming to take back Alterna ? The curtain rise on the ENDGAME of that adventure born from the ashes!​​​​