Mori no Koe - Wallpaper and Scan Gallery

Mori no Koe is divided into five main stories that take place in an alternate universe where demons exist and are sold to humans as slaves. Due to their strong magical and physical abilities (spell songs, high stamina, superhuman strength etc.), they are considered threats and treated worse than animals.

1) Otoyami no Mori (Voice Of The Forest): doctor Ao Shinrii buys a demon on a whim, after seeing the wounds on his body. He names him Ian and takes good care of him, but after a while starts thinking that Ian would be better off living free.

2) Yumeoi no Mori (Dream Chasing Forest): during an expedition, Biology scholar Vim Ryder is separated from his colleagues, falls off a cliff and loses consciousness. He awakes to find himself chained to a bed and prisoner of a child demon by the name of Alcan, who threatens to kill him if he runs away.

3) Itsuwari no Mori (Deceitful Forest): Yuusu, an aristocrat, has loved the demon Hugh ever since he was a child, but why doesn't Hugh reciprocate?

4) Yoru Utau Mori: Alcan suddenly reveals his aggressive side, which prompts Vim to back off and return to his village. Unfortunately, he isn't welcomed as he'd hoped and instead thrown in prison for conspiring with a demon.

5) Mori ni Shizumu Tsuki (The Moon Sinking Into The Forest): after fleeing their country, Ao, Ian, Hugh and Yuusu clash with Alcan in the outskirts of Delvis, the country's capital city. Looking for a place to stay, they end up at Vim's institute.

Omakes:
1) Alcan explains why he ran away from Vim in chapter four.
2) Soldiers burst into Vim's institute, demanding that he have Alcan's magic powers sealed.
3) Ao talks to Yuusu and Hugh about his and Ian's past (the events of the first chapter), only to remember that it's time for Ian's periodical checkup.

Note: even though the oneshot Yurusareta Uta isn't part of Mori no Koe, it takes place in the same universe.

Credit: pandemonium91