Grisaia no Rakuen

Synopsis

After riding on a train, the girls arrive at their new home, a boathouse owned by Yumiko who believes it best to be able to move around, hideout and all, should the need arise. In the holding facility, Yuuji confirms that the hologram is indeed Kazuki after she answers his question. She then reveals that Oslo had smuggled a new kind of nuclear bomb that can cover a radius of 50 kilometers should it explode. She also explains why Yuuji is valuable to Oslo; Yuji is the only survivor of a human experiment to create the ultimate soldiers through various experiments, drug administration, and testing. However, the side effects of the booster drugs used on the test subjects produced adverse side effects which resulted in the experiments' deaths within 2 years but Yuuji survived thus making him a valuable project sample. Meanwhile, Michiru finds a cellphone in her bag which then rings and Kazuki's voice is heard despite the number belonging to Yuuji's phone. She introduces herself as Thanatos offers the girls her assistance to rescue Yuuji in order to disrupt Oslo's plans. Despite their doubts, they decide to cooperate with her not knowing who she really is but Amane seems to find the voice familiar but could not remember properly. The next day, Kazuki provides each of them all with special cellphones in order to contact each other without being traced. Before explaining her plan, she convinces Yumiko to admit her feelings for Yuuji in order to test her resolve. Back at the Thanatos System's holding facility, Kazuki reveals the truth of what happened to her during the bus accident years ago after Amane had escaped while she was left behind.

(Source: Wikipedia)