Third-year middle school student Yu-yu Kondo lives in Kanazawa city of the country of Kaga. Being unable to reject requests, Yu-yu often gets caught up in his sister's hobbies. When Yu-yu could no longer bear it and ran away from home, he was saved by Megumi Okura. Megumi invites Yu-yu to the Night Amusement Park "Wonder Hill" where her friends gather. The amusement park is where many youths of the Vanguard-centric group "Team Blackout" gather. And this is how Yu-yu encounters Vanguard and was drawn in by the appeal of Vanguard and the world and friends he had never seen before.

Masahiro Itoas Zakusa Ishigame (voice)
Shouta Aoias Yuyu Kondo (voice)
Yuki Onoas Danji Momoyama (voice)
Yuma Uchidaas Tohya Ebata (voice)
Amane Shindoas Megumi Okura (voice)
Hikaru Tonoas Tomari Seto (voice)
Shuta Morishimaas Masanori Iseki (voice)
Yuki Nakashimaas Mysterious girl Mirei (voice)
Anan Furuyaas Teammate (voice)