
The lives of 2 high schoolers drastically change after the arrival of the Kado cube and the unlimited energy source Wam.
Largely takes place after Episode 5 of the anime or Chapter 4 of the manga.
正解するカド 青い春とレールガン / Seikai Suru Kado: Aoi Haru to Railgun / Seikaisuru Kado: Aoi Haru to Railgun