For Naoki, the arrival of the mysterious Mikoto Amagaki was a life changing experience to say the least. Having embarked on a search for her long lost brother, Mikoto has managed to stir a great deal of questions in our young hero, including wondering why he has dreams of the brother's wrongdoings as they occur, and consequently, why this man looks so much like himself! With amnesia blocking the memories of his past, and secrets left unrevealed, it seems the joy and sadness in young Naoki's life is only just beginning...
For Aizawa Yuuichi, returning to the town where he spent his childhood has been an unusual affair. Yuuichi, it seems, has forgotten his memories of the past, including encounters with several young ladies who would love nothing more than to see him again. As the days pass, flickers of the past began to surface, revealing more and more of the dark events that once came to be. As the reuniting continues, Yuuichi soon starts to realize that his past may be far more complex than he once believed it to be...
Hani Hani Operation Sanctuary and Kanon have the same premise followed by similar character personalities. Things are approached in a bright manner initially, but later on they build in mystery and drama. Also, both anime seem to be about everyday life, but contain fantasy elements. The theme of memory loss is presented in the two anime.
Juuna Tono is a boy without a past. Orphaned by a tragic accident that claimed the lives of his parents and his memory, Juuna and his younger twin sister Senna have only survived by their commitment to support each other. But when a strange girl greets him as “Big Brother” (onii-chan) Juuna turns to her and says, “Haru…hi?” It is someone from his forgotten past, who Senna claims is his childhood friend… or is she? Senna is obviously distraught at her appearance. To clear this mystery Juuna must reclaim his memory and his past to create a bright new future.