StrypeyThanks for the suggestions. ReadEra doesn't seem to be available in F-Droid (yet?). But I tested KOReader and Librera Reader and I the latter seems like exactly what I'm after. I remember trying KOReader in the past and finding the interface ... unfriendly.
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.