I think 'Love in the Moonlight' could be somewhat similar. It has a similar romantic and dramatic tone.
You could check out 'Secret Love'. It shares some similarities in terms of the intensity of emotions and the unexpectedness of the storyline, like in One Night Only.
I think 'My Secret Romance' could be similar. It has elements of romance and unexpected encounters like One Night Only.
The plot of 'Manga One Night Only' could vary greatly. It could be a story of self-discovery during one eventful night, or a fantasy adventure that takes place in a short span of time.
It's got a unique plot and great art. The characters are really engaging and the story keeps you hooked.
You might find 'Moonlit Shadows' comparable. Both have elements of mystery and adventure set in the night. Also, the character development and the plot progression share some similarities.
Maybe 'Black Butler' is comparable. Both have dark and intriguing storylines set in a night-like atmosphere. There are complex characters and unexpected plot twists in both.
You could try 'Parasyte'. Both have elements of the supernatural and characters dealing with strange phenomena. Also, the art styles have some similarities.
One manga that could be similar to Only Hope is 'Dreams and Wishes'. It shares similar themes of hope and determination.
One manga that could be similar is 'Soul Eater'. It has elements of magic and unique powers like in 'The Only Necromancer'.
Well, you might like 'Tokyo Ghoul'. It has that similar dark and mysterious vibe like Pumpkin Night.
I'd recommend 'Shadowland'. It shares elements of mystery and suspense with 'Dreadful Night', and the art styles are somewhat comparable. Plus, both have characters that keep you guessing.