Harukanaru Toki no Naka de is the first installment in the Haruka series, the starting title for the second and longest Neoromance IP. It is the game which receives the most outside coverage and spin-offs within the series. Yasuhiro Misawa is the main composer for the game.

At the time of the game's conception Heian period based stories were receiving an explosion of popularity in the Japanese entertainment industry. Ruby Party used the trends to their advantage to create their first Japanese history based IP. Members wished for the game to keep the same simulation elements as its predecessor yet thought it better to include role-playing game elements which were still in high demand with the female fanbase. To further distinguish it from their first work, members sought to highlight the seasonal beauty of spring and summer through the lens of Heian aesthetics.

The story begins in the spring of 2000. The protagonist is a normal high school girl who goes with her two schoolmates, Tenma and Shimon, to investigate the occult rumors of an abandoned well near their school. When the trio approach it, they are inexplicably summoned to a parallel world resembling the capital of 10th century Japan. Upon their arrival, the protagonist is informed that she is the White Dragon Priestess and her friends are two of her anointed Eight Guardians. Her divine duty —which must be completed for their return to their home world— is to protect the capital from vengeful spirits and the nefarious Demon Clan.

Harukanaru Toki no Naka de: Hachiyoushou is a remake of the first game. It was repackaged to tie into the eponymous animated TV series adaptation's broadcast.