Elektra is a comic store, at the western end of the Calle Estrella/Calle de la Luna range of friki tiendas.
Of the shops in the area, it’s possibly the best comic shop, which is no mean feat, with a good selection of both individual issues and trade volumes.
It’s also home to a more extensive selection of manga than most places, though with Otaku Center being so close that’s probably a better option.
There’s also a decent range of t-shirts available, along with a good range other merchandise related to comics, film and TV.
All-in-all well worth a visit if you’re in the area.
Official website: https://elektracomic.com/
Open: 10:30-20:30 Mon-Fri, 10:30-14:00 & 17:00-20:30 Sat.
Nearest Metros: Santo Domingo or Noviciado (line 2), Callao (lines 3 & 5).