Also known as: 海斗
The protagonist of Hakuchuumu No Aojashin Case-0. At the beginning of the story, Kaito is completely clueless about his situation and does not possess any memory of his past, despite recognizing most of the objects he comes across. Although he finds Yonagi (Hakuchuumu No Aojashin)'s actions strange, he wants to help her grow after learning that the experiment is being done for her sake.