I Picked Up the Demon Lord (volume)

is volume 1 of the Beelzebub manga.

Chapters
001. I Picked Up the Demon King (魔王ひろいました, Maō hiroimashita) 002. I Became a Gang Leader with a Child (子連れ番長はじめました, Kotsure banchō hajimemashita) 003. Damn Strong Evil Bastard (強くて凶悪でクソヤロー, Tsuyoku te kyōaku de kuso yarō) 004. FLY!! 005. Planned to Become the Mother (母親になったつもりで, Hahaoya ni natta tsumoride) 006. That (あれ, Are) 007. Stop Fighting (ケンカやめます, Kenka yamemasu)