Wildcard

Wildcard (ワイルドカード, Wairudokādo) is a manga written and illustrated by Jiraiken.

Plot
Can the world change through the power of imagination!? Daisuke Yamamoto is an 8th grader who has Chūnibyō, but things get little bit out of hand as he was bullied and almost forced to commit suicide but didn't do so and discovered an app called "Arcana", afterwards the mysterious figure from his imagination appears and his imaginary world turns into reality.