A boy trying to find the paradise he once lost arrived in a secluded garden at the end of the world, where he found five girls. Not knowing himself what the result would be, he took out five seeds and distributed them to the girls, driven by a sense of duty and perhaps even the faintest murmurings of something like hope. One by one, the girls planted the seeds they had been entrusted with in the ground around them, waiting for the day when they would bear fruit.

But whether or not this day will come remains to be seen - everything hinges on one final struggle to learn where a true paradise is to be found.

This story picks up immediately after the events of Grisaia no Meikyuu, with Kazami Yuuji having been detained for suspected involvement with an international terrorist organization, lead by Heath Oslo, that has managed to enter Japan's borders with a devastating new weapon of mass destruction in hand.

The final chapter in the Grisaia series, featuring Prologue De La Grisaia, a prologue set before Yuuji's arrival at Mihama; Blanc Aile no Tane, the overarching story's grand conclusion; a smorgasbord of bonus eroscenes; and an after story to the events of Blanc Aile no Tane.