Despite their distinctive personalities, Souma Shiki, Hayate Ichikura, Shun Futami, and Takayuki Mima all have one thing in common: though naturally clumsy, the four disguise their embarrassment from tiny slip-ups by maintaining a composed demeanor. However, it is actually the guys' airheaded natures that makes the girls' hearts throb. No matter what happens in their daily lives, the boys do their best not to lose their cool!

After moving into his new apartment, art school student Tatsuhiko Kido discovers a crack in his wall. When he peeks inside, he makes eye contact with his neighbor, Emiru Ikuno, as she masturbates. He rushes next door to clear the misunderstanding and inform her of the crack, but accidentally trips and falls over her in the process. To make matters even worse, Emiru now has photographic evidence that would plainly depict Kido as a sexual offender. Kido then learns that Emiru has a voyeurism fetish, and is blackmailed into leaving the crack as is. Unfortunately for Kido, it doesn't stop here! Emiru is also attending the same art school that he is, and he will be seeing her far more than he would like to. Emiru and Kido are set to embark on a unique friendship with wildly erotic potential.

Lu Guang loses everything when a mysterious man bursts into the photo studio that he is renting with his close friend Cheng Xiaoshi. The man, who comes to punish the members at the studio for playing with time, murders both Qiao Ling and Cheng Xiaoshi in cold blood. However, Lu Guang inherits his friend's power to go back in time and decides to save everyone from their grim fate. Now in the past, Lu Guang travels to Bridon to help Cheng Xiaoshi investigate his father's whereabouts; however, he discovers an uncanny series of small disparities that cause the situation to spiral into complete uncertainty. Suddenly unable to rely on his ability to predict the future, Lu Guang must invent a new strategy to foil the plans of the man who took everything from him.

When college student Keiichi Morisato dials the wrong number while ordering for some food at his dormitory, he accidentally gets connected to the Goddess Hotline and a beautiful goddess named Belldandy appears out of a mirror in front of him. After getting kicked out of the dorm, Keiichi and Belldandy move to an old shrine and soon afterwards, Belldandy's sisters Urd and Skuld move in.