Oite Kebori

The curse echo of The Whispering Canal.
Curse: Kills by drowning one who leaves the curse bearer behind.
Its curse bearer is Shogo Okiie.

Spoiler

In truth, its curse bearer is Yoko Fukunaga, which she keeps during Common Route while Shogo becomes its second curse bearer exclusively in his route.

Resentful Memory:
Toki loved fishing with her father Jinkichi more than anything. With her wicker baskets on their backs, they would leave for the canal every morning and fish till the evening. The miso soup her mother Koma made using the carp they caught was to die for. Her parents loved her dearly.
One day, however, her father disappeared. Toki's mother went to look for him and never came back either. Those who came to express their concern eventually stopped visiting her out of fear. Toki continued to wait, all alone.
"Mother, Father, where did you go? Don't leave me behind..."
Unable to bear the loneliness, she left home and trudged along the roads until night fell. Neither her mother nor father were anywhere to be found. Tears stung her eyes.
Suddenly, the sound of fish splashing in the water cut through the silence. She found herself standing before the canal where they used to fish together. The taste of carp and the memory of her father's smile flashed across her mind. Without thinking, Toki walked into the moat. The sound of water splashing echoed throughout the night air. Passerby thought go it only as the fish in the canal.
The splashing faded, and silence returned to the lonely night.

Spoiler

Toki heard the story of the Rite of Resurrection from the visiting Seiman and regaled the story to Old Man Kanzo. As a result, stories about the Rite began to spread, attracting Lady Ashino to Honjo, which ultimately resulted in the deaths of her father, her mother, and Kanzo, unbeknownst to Toki herself.