A Certain Scientific Railgun Vol. 11 (manga)

Sweet Dreams!

With the Daihasei Festival behind them, an unusual calm has settled over Academy City. That is, until a weird rumor begins to circulate. Supposedly someone has created a machine that can manipulate what a person dreams, allowing good dreams to be shared. But when it's revealed that these altered dreams affect reality itself, is this newest Esper invention a gift or a curse?