Hamuo 
Hell Mode (Manga): Volume 5 [EPUB ebook] 

Allen’s Academy life begins! And he has just one goal: to become stronger! To do so, he forms a party with Krena, Dogora, and Cecil. Together, they take on dungeons, earning them levels and money. All in all, it’s looking like a pretty comfortable life.

But Allen soon realizes that his party needs a healer. To fill that role, he recruits a mysterious Cleric named Keel. The boy seems a bit shy at first, and he’s clearly strapped for cash, but he hesitantly joins Allen’s party to earn money for his family. But just who is Keel? Will he get along with the rest of Allen’s party? And can Allen accept that being in Hell Mode puts him at a level disadvantage?