Vertxt Reader ProMyNikko
1.0.3 Varies with device
Vertxt Reader Pro is a vertical text reader that supports UTF-8, UTF16, Big5, EUC_JP, EUC_KR, GBK, and SJIS (auto-detection included). It is best suited for reading Chinese, Japanese and Korean literature that is in pure text format.
If you prefer horizontal layout, please try Hortxt Reader.