Multiverse Girlfriend

Shuri Tenka has been living a reclusive life ever since his childhood friend, Yumeno Nozomi, died in a traffic accident.
One day, a god suddenly appears in his room and tells him, "Because of you, the universe is now in grave danger." The only way to stop the impending explosion of the entire universe is to be united with one of the four Nozomis who have come from the multiverse!? Living under the same roof with these four girls who look just like Nozomi but are subtly different, can Tenka stop the universe from exploding?