Yasukiyo Kotobuki 
The Diary of a Middle-Aged Sage’s Carefree Life in Another World: Volume 2 

Zelos is back in the Far-Flung Green Depths—but at least he’s not alone this time. Celestina, Zweit, and a squad of knights have joined him for a training camp, looking to get some combat experience against the deadly monsters that lurk the forest. Their levels are already skyrocketing, but things are getting tougher by the day. Will they all make it out alive? And will they be the same people when they return?

Not that leaving the forest will be the end of their worries: more dangers await them outside, as does a certain girl with whom Zelos might have more in common than the two of them first expect. And of course, with the training of his students coming to an end, Zelos is set to face another enemy that no amount of magic can vanquish: the looming specter of unemployment…