Taking place after the events of Heaven and Earth and before Exodius, Behind the Line depicts the moments of boys and girls after Soushi Minashiro returned home.

Each of the six BD/DVDs will include one short. They will feature the characters in a "slighly risqué" light not seen in the main story.

Urobe was a son of the great chief of Pyrimi, Africa. One day he hung on an airplane and came to Japan. Because of the cold and hunger, he fell on to the yard of Shishio’s house, and Shishio nursed him. Kurobe was very thankful for him and began to repay for his kindness. Kurobe dug a big hole in the yard.Every time he returns the favor, he threw a stone into the hole until stones would fill the hole. (Source: ANN)

Hisashi Seki, ordinary working guy, wakes up one morning to find a naked, and very amorous, girl in his bed. He's happy to take advantage of the situation, to their mutual satisfaction. However, the girl's appearance leads to all sorts of increasingly strange phenomenon. The cause lies, sort of, in Jungian psychology. The girl, whom he has named Asami, is from a parallel dimension where people's ideal partners - the anima to their animus, or vice versa - reside. Asami's longing has allowed her to cross dimensions to be with Seki, but her presence in his world upsets the natural order. She goes back, and Seki must venture to her world to save her. The lovers are reunited. However, matters don't turn out quite as they hoped.