Chapter 39: The Begining of Darkness ~That Time~ the thirty-ninth chapter in the To Love-Ru Darkness manga series.
Summary
Yami is seen in her ship in a talking to Lunatique, who asks about and changes in her mental state, to which she replies, no, as this is Sainan. Rito then wakes up to find Momo doing suspicious actions to him. Rito quickly gets away from Momo. Momo then states that she will give him her body to him while he is awake saying she is not what she used to be and will do what she must for the harem plan. After Rito's rejection of this idea Momo states how well the Harem plan is going and that even Yami will fall too.
At Sainan High, Rito is seen thinking on Momo's words causing him to run into Yami causing her to get angry only to be saved by Haruna . At the school's pool the girls are having there swimming classes. Mea and Yami are talking, when Yami says that by observing her interactions with humanity she was able to learn more about herself. After Yami finally came to terms with her problem the hidden weapon inside her called Darkness emerges as stated by Nemesis who saw everything. What Nemesis says is that inner peace was the key to activating Darkness. With Darkness activated Yami's powers seemingly out of her control assault her.