The story starts with the death of Hikaru Mikado. That guy was a natural charmer, a “harem king”, but had no real male friends. After he died, he became a ghost, a soul, but Koremitsu Akagi can see him. Koremitsu though, isn’t really like Hikaru. His red hair and his evil-looking eyes make him look as a delinquent, even though he is very kind inside. Hikaru asks him a favour: he wants to fulfill a promise, which he couldn't fulfill anymore. The promise was to give his girlfriend and fiancée, Aoi Saotome, 7 gifts for her seventeenth birthday. Koremitsu accepts, and has to work hard to help fulfill Hikaru’s promise with Aoi.
Adapted from the light novel series Hikaru ga Chikyuu ni Itakoro
Alternative:
'아오이' 히카루가 지구에 있었을 무렵; «Аой» — когда Хикару был жив......; “葵" ヒカルが地球にいたころ……; “葵” 光还在地球的时候……; "Aoi" Hikaru ga Chikyuu ni Itakoro......; "Aoi" When Hikaru was on the earth; "Aoi": Hikaru ga Chikyuu ni Itakoro......; "اوي" عندما كان هيكارو على الأرض; Aoi Hikaru ga Chikyuu ni Itakoro......; Khi Hikaru còn trên thế gian này …… “Aoi”; อาโออิ แด่รักและความทรงจำของฮิคารุ