They say that if you set off fireworks at a certain abandoned airfield outside of town on a midsummer's night, the spirit of a young woman who took her own life might appear before you. Three teens from different high schools, all interested in this local urban legend, come together on one fateful evening when the boundary between life and death grows thin...

According to urban legend, there's an abandoned airfield on the edge of town where a spirit known as the Summer Ghost can be summoned. After discovering each other on the internet, three teenagers from different high schools who share a special connection to death meet up to summon the mysterious specter. Thus begins a story that will bridge the boundary between life and death on a midsummer night that none of them will ever forget.

A high school boy finds the diary of his classmate--only to discover that she's dying. Yamauchi Sakura has been silently suffering from a pancreatic disease, and now exactly one person outside her family knows. He swears to her that he won't tell anyone what he learned, and the shared secret brings them closer together in this deeply moving, first-person story that traces their developing relationship in Sakura's final months of life.

In an age when artificial intelligence has become integral to human life, AI songstress Vivy captures people's hearts with her enthralling voice at a theme park, NiaLand. When a mysterious AI who calls himself Matsumoto appears and claims to be from one hundred years in the future, he warns Vivy of the coming apocalyptic battle between AI and humankind. Can Vivy help prevent an all-out war one hundred years hence, and save humanity from destruction?

The Singularity Project, the century-long mission to prevent the climactic war between AIs and humanity, is well underway. When Vivy awakens for the next Singularity Point, she finds a world of AI far more advanced than in the original history. To get to the bottom of this mystery, Vivy goes to see leading AI researcher Saeki Tatsuya--the first human to marry an AI. But if an AI has no heart, is this love story nothing more than a fabrication?

The Singularity Project is over, but Vivy wakes up to a hopeless sight: the climactic war between humans and AIs she worked so hard to avoid! With humanity on the brink of destruction, Vivy seeks out Professor Matsumoto, the creator of the Singularity Project who knows where it all began. Humans who loved AIs, humans who hated them, AIs who grew close to humans, AIs who supported each other... This is the end of all their stories, the grand finale that brings the songstress and her partner...

Vivy takes the stage at the Zodiac Signs Festival, site of the next Singularity Point. There she meets Ophelia, an AI who committed suicide in the original history, and must confront the idea of whether AIs have souls. During their search for the truth to prevent the incident, Vivy comes face-to-face with a human she knows...a human who shouldn't exist!So, does an AI taking her own life prove she has a soul, or does it point to something else entirely?

Every night, Adachi transforms into a nightmarish creature--and every morning, he reverts to human form. When he encounters his ostracized classmate Yano Satsuki in his monstrous state, the two develop a peculiar bond. But daylight brings its own form of terrors. Which is worse, the monsters at night, or the cruel realities of the classroom by day?

A Story of Secrets, Love, and LossA high school boy finds the diary of his classmate--only to discover that she's dying. Yamauchi Sakura has been silently suffering from a pancreatic disease, and now exactly one person outside her family knows. He swears to her that he won't tell anyone what he learned, and the shared secret brings them closer together in this deeply moving, first-person story that traces their developing relationship in Sakura's final months of li...

FEAR NOT THE DARKEvery night, Adachi transforms into a nightmarish creature--and every morning, he reverts to human form. When he encounters his ostracized classmate Yano Satsuki in his monstrous state, the two develop a peculiar bond. But daylight brings its own form of terrors. Which is worse, the monsters at night, or the cruel realities of the classroom by day?

An unhappy girl who engages in self-harm, a woman ostracized by society, and an old woman looking to live out her twilight years in peace--what could three such different people have in common? That's what grade schooler Koyanagi Nanoka is trying to find out. Assigned by her teacher to define what "happiness" means to her, Nanoka sets out to get to know these three strangers--and through them, perhaps, to know herself too.

Swear You'll Never TellFive high school classmates hold secrets close to their hearts--hidden talents, unspoken feelings, and buried pain. As they collide with each other on the path to growing up, they might jostle some of those secrets free. From Yoru Sumino, acclaimed author of I Want to Eat Your Pancreas and I Had That Same Dream Again comes a gentle, intriguing tale about love, life, and the things we leave unsaid.