Update on February 10, 2023: The March 2023 issue of Square Enix‘s Monthly Shonen Gangan magazine revealed on February 10 that the manga will end its serialization in the magazine’s April issue on March 10.
The manga entered its “final battle” in November 2021.
en Press is publishing the manga in English, and it describes the story:
Gotta flirt to save the world!!
High schooler Takuma Akutsu is terrified of human contact and just wants to live a quite 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 gettin’ down & dirty to the max!!!
Asakura launched the manga in Square Enix‘s Monthly Shonen Gangan magazine in December 2015. Yen Press released the manga’s 12th volume on July 5.
The manga inspired a television anime adaptation that premiered in October 2019. Sentai Filmworks licensed the anime and streamed it on HIDIVE as it aired in Japan. The company released the anime on Blu-ray Disc in November 2020.
Source: Val x Love volume 15