It is August 12th. After the remote control to his boarding house's only air conditioning unit is inadvertently destroyed by spilled cola, "I" devises a plan to return to yesterday in a time machine to recover the remote before it breaks. However, his prankster friend Ozu cannot resist playing with past events, even if it means bringing the universe to the brink of destruction. Now "I" finds himself racing through time to avoid disaster.

Shinichi Chiaki is a first class musician whose dream is to play among the elites in Europe. Coming from a distinguished family, he is an infamous perfectionist; not only is he highly critical of himself, but of others as well. The only thing stopping Chiaki from leaving for Europe is his fear of flying. As a result, he's grounded in Japan.

During his 4th year at Japan's top music university, Chiaki happens to meet Noda Megumi—or as she refers to herself, Nodame. On the surface, she seems to be an unkempt girl with no direction in life. However, when Chiaki hears Nodame play the piano for the first time, he is in awe at the kind of music she plays. To Chiaki's dismay, Nodame moves into the apartment next to his and finds out that she is head-over-heels in love with him.

Three problem children - Izayoi Sakamaki, Asuka Kudou, and You Kasukabe - suddenly receive an invitation to another world known as "Little Garden" from a girl called Black Rabbit. Battles, laughter, sex appeal... anything goes in this new tale of adventure!

When a college dropout stops for a late night bite at a mysterious ramen stand, he crosses paths with a self-proclaimed deity of matrimony. This bizarre meeting sends the young man hurtling through a horrifying flashback to his not-so-glorious college days when the influence of a cruel new friend turned him from a hopeless romantic into a mischievous “black cupid.”