Val x Love

Val x Love (戦×恋(ヴァルラヴ)) is a manga by Ryosuke Asakura. It began its serialization in the Shounen Gangan manga magazine December 12, 2015. It has been licensed for release in English by Yen Press.

Plot
High schooler Takuma Akutsu is terrified of human contact and just wants to live a quiet life. Too bad he doesn't have a choice in the matter when nine Valkyrie sisters come barging into his home! They've tasked him with raising their level to fight off the monsters threatening humanity--and how will he do that, exactly...? By being intimate, of course!