CHERA -A Flower in the Dark-

CHERA -A Flower in the Dark- is the prequel to Lost Smile and Strange Circus. The game explains the backstory of Oddman and Noah's mother Chera, as well as introduces a new cast of characters. The story is separated between the Main Story and side stories from Oddman's travels. There is no official English version of the game, however fan-translations can be found on this wiki.

Official Summary
Translated from the App Store description.

"Oddman, are you glad you met me? Are you happy...?"

Oddman, the Strange One who lives alone in the Darkness, and Chera, the girl holding a flower. They exit the Darkness in search of something beautiful, but what awaits them is a rotten world known as the Backstreets.

This is the story of a girl and a creature who can never be human, growing closer together despite this cruel world.

Gameplay
Similar to the first game, CHERA's gameplay consists of tapping the characters on your homescreen to obtain affection points. You will unlock a new section of the main story every time your heart gauge reaches the halfway point or fills up to the top. Meanwhile, you can access side stories by clicking the Oddman icon in the upper left corner. Only a certain selection of these may be accessed depending on where you are in the main story, but they will unlock naturally as your game progresses. You can find all previously-seen stories under the "Memories" (思い出) tab at the bottom of your homescreen.