Hints of neuro linker? - Imgur

Neuro Linker Prop (from Accel World) by nimaruichi on DeviantArt

Between these two gadgets I'd say Neuro linker :D

Açúcar Lunar - Accel World - Paraíso em inglês

Can't Feel My Heart [Explicit] by NeURO, Linker, Juicy BAE on Music

Neuro Linker Chronicles Reliving Accel World's Digital Adventures

Gonna try and explain if this might be possible with my VERY basic understanding of technology currently (explained in the comments btw!) : r/BoFuri

Morph Collar - Base Model

Found at Target, what gun is this supposed to be? : r/halo

Accel World Stickers for Sale

Model Bingo 1/100 Stargazer 2.0 Gundam Conversion Kit