I spotted that Ascendance of a Bookworm which is free on this list is being read by the Advanced Book Club at the moment (link). The novel version, not the manga.
This one also caught my eye on the list of free manga on Book Walker:
犬夜叉 Inuyasha
From Wikipedia: Inuyasha (犬夜叉), also known as Inuyasha: A Feudal Fairy Tale (Japanese: 戦国御伽草子 犬夜叉, Hepburn: Sengoku Otogizōshi Inuyasha ), is a Japanese manga series written and illustrated by Rumiko Takahashi. The series begins with Kagome Higurashi, a 15-year-old school girl from modern-day Tokyo who is parallelly transported to the Japanese era of Sengoku period after falling into a well in her family shrine, where she meets the half-demon, Inuyasha. When a demon from the era tries to take the magical Shikon Jewel embodied in Kagome, she inadvertently shatters the Jewel into many pieces that are scattered across Japan. Inuyasha and Kagome set to recover the Jewel’s fragments, and through their quest they are joined by the monk Miroku, the demon slayer Sango, and the kitsune Shippo. Together, they journey to restore the Shikon Jewel before its full power falls into the hands of the evil Naraku.