Aganai no Seija

A mother who killed her own child and committed suicide. A cold father who is absorbed in her work and doesn't care about her daughters. Murasaki and Kaho, twin high school sisters with such parents, lived in a small world isolated from society. One day, on a street corner, Hanaho meets a mysterious young man who disguises himself as a pastor, calls himself "Master,'' and runs the religious organization "Mary Magdalene.'' Kaho leaves home and travels around Japan with the young man. However, the young man was also a swindler who sold tap water as the water of life. Still, she ends up following him. I felt like he could take me somewhere other than here.

Note: This manga was inspired by the real pseudo-religion/cult named "Jesus' Ark".