Synopsis: A. - Answer

Mitsu Chikusa is a 16-year-old student at an industrial high school pursuing architecture. Unfortunately, a fall down the stairs has caused amnesia, and Mitsu is struggling to remember her past. Returning to school, she's grateful for the support of her friends and boyfriend, Hideto Hongou. But when she finds a note saying "I like A," Mitsu's confused since the only two people she knows whose name starts with an A are her childhood friend, Akashi Kurokawa, and her chemistry teacher, Akaike. This discovery makes Mitsu wonder why she's with Hideto, especially since he seems to be hiding something from her. Desperately wanting to uncover her past, Mitsu becomes obsessed with discovering who A really is. Volume 2 includes a one-shot called Nemureru Shishi ni Ai no Koe.