3 needed to calculate an average
Both of those manga made me think of gender bent Scott Pilgrim vs. the World, since both feature a girl fighting evil exes\rivals for the sake of being with the one she loves. In case of Nejimaki Kagyu, the defeated rivals become supportive friends, but in case of Oddman 11... it turnes into a yuri harem. Both series have unique art style, but when it comes to the style of the series itself, Nejimaki Kagyu oscillates between cute and freaky, while Oddman 11 moves towards being squick. I can't guarantee you will like both of them (as mentioned before, the style is quite different), but if the similarity to Scott Pilgrim vs. the World made you curious, then you could give them a try.
Nozomu Itoshiki is a high school teacher who views everything in life in the most negative way possible. Even his name reflects his personality: if the Japanese characters are written horizontally, they spell out 'despair.' One day during one of Nozomu's many suicide attempts an incredibly optimistic young girl named Kafka Fura rushes to save him from hanging on a sakura tree. Nozumu later finds out that Kafka is a student in his new class! In fact Nozomu's new class seems to be made up entirely of strange, troubled individuals who constantly foil his attempts to end his life.
Even though both series are crazy comedies and both feature a unique art style, I can't name anything specific that would connect them in terms of story or characters. Even so, my gut tells me you might like one if you liked the other.