Line X: One Way


 * Did you mean Line X: Places, the bonus-chapter of the tenth volume; Line X: Bed; the bonus-chapter of the twelfth volume; or Line X: Johannes Kleeman, the bonus-chapter of the fourteenth volume?

One Way (ワンウェイ) is the last, mini-chapter of the eleventh volume of the of the Devils' Line manga series.

Summary
Yuu Kagasaki ponders on how he fell in love with Naoya Ushio.