The Summer Hikaru Died Series 5-Book Set is a gripping and atmospheric horror-mystery series that explores themes of identity, grief, and the supernatural. Set in a quiet rural town, the story follows Yoshiki, whose best friend Hikaru mysteriously vanishes, only to return as something not quite human. As Yoshiki struggles to come to terms with the unsettling changes in Hikaru, dark forces and eerie secrets begin to surface, testing the boundaries of friendship, love, and fear. This hauntingly beautiful series blends psychological horror with emotional depth, making it a must-read for fans of eerie, thought-provoking narratives.