Yuusha Yuuta "Dark Flame Master

Age: 15 (S1) 16 (S2) 17 (Movie 2) Sign: Cancer Height: 169.8 cm (5'7") Weight: 60 kg (132 lbs) A high school boy who used to be a delusional teen, believing himself to be the Dark Flame Master and becoming alienated from everyone as a result. Finding this to be embarrassing, he attempts to erase this past from existence, even choosing to go to a separate high school from all of his junior high school classmates. However, after encountering Rikka, his past delusions come back to haunt him.

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As the story goes on, Rikka and Yuuta fall in love eventually creating a "lover's contract" between them, a chuunibyou term they came up with in an attempt to avoid being in a normal relationship..

(Source: Wikipedia)