Makoto Toba hates everyone in his class. Everyone except, Sakura Touwa, an introverted high school girl who lives with her grandma and loves video games. But one day, Sakura disappears right in front of Makoto? Makoto has visited the site of her disappearance on the anniversary of her disappearance for the last 16 years. That is, until Sakura comes back from the time slip she was stuck in, and to her not a moment has passed. Now at 32 with a girlfriend, Makoto has to take care of his 16-year-old childhood crush. What could possibly go wrong?

A tale about the complex matters of love between a young erotic manga artist and a girl in middle school.

One day, a high school boy named Rumi comes across an abandoned, decommissioned tram car, a place that could make a neat 'secret base.' He also meets the wildly energetic Fujino, who challenges him to a duel over usage of the space. Their duel is actually a very creative, competitive game played out in the public areas of the town. While Rumi almost can't believe what's happening, he has to admit that their 'duel' is the most fun and excitement he's had in a long time, much more exciting than his video games. Before long, Rumi and Fujino are friends, and their adventures with the abandoned tram car, soon named the "Black Parade," have begun!