Shinya doesn't get stellar grades, he's not athletic, he's a coward, he's a wimp...he's a general good-for-nothing. One day, he meets Haruna, a girl that could change his life forever. Haruna tells Shinya he is the Messiah. The Lord chosen to save her world and that she is his shield.

Could it be true? Could Shinya's life of ineptitude be balance for this one grand cause? Is he really the Messiah? If he is, can he save himself, let alone an entire world?

Included one-shots: Volume 4: Night Keeper Volume 6: Exorcist

Watashi no Messiah-sama was initially published in Shounen Gangan from January 12, 2002 to March 12, 2004. It moved to GFantasy on September 18, 2004 under the title Watashi no Messiah-sama: Lacrima. Volumes 1-6 retain the original title while volumes 7-13 contain the subtitle with the chapter count restarting at 0.

In 2009, Kadokawa Shoten reprinted the series into six bunkoban volumes. This version edited the order of the chapters and didn't include the two one-shots, but instead added the kakioroshi chapter in volumes 5 and 6 titled "Kyou no Meshi 2009" (今日の飯2009).