Both of these revolve around a highschool boy's daughter arriving from the future in an effort to change said future. The boys (neither of whom even have a steady girlfriend yet) each find the situation quite difficult to believe. In both cases, the daughters cause quite a bit of chaos during their efforts. Mahou no Iroha is magically oriented while Little Jumper is technilogically oriented.
Those two series have a similar plot. In both a girl comes from the future and tries to help her future father meet with his future wife. While both series have some action in them Little Jumper is much more action orientated. Both series also future some subtle romance between the guy and his future daughter (rather than his future wife). If you read one and liked it, you'll probably like the other one as well.
In the future, Earth has a major problem: over-population. To combat this threat, nobody is allowed to have more than one child. However, this isn't a permanent solution, so scientists have searched long and hard for the root of the issue, and in the end, they found it: Junta Momonari, a mega playboy who, in his time, impregnated one hundred women! And so, Karin Aoi, a DNA operator, is sent back to the past to inject Junta with new DNA that should solve the problem once and for all... there's just one problem: Junta has a serious allergy to girls and throws up whenever he sees them! Regardless of Junta's lack of symptoms, Karin must carry out her mission; and that's where things start to get interesting...
Both series are about a girl/woman from the future who travels back in time to stop a sex-obsessed guy who wreaks havok in the future. Strangely, the version of the guy that the girls encounter is the exact opposite of what history says. In both cases, the reader is left wondering if history made a mistake, if the time travellers wind up causing the very events they were trying to prevent, or if something else is going on.
The titular story from Tenshi no Okurimono and Mahou no Iroha! have a similar plot. Both revolve around a little girl from the future who tries to get get her (not yet married) parents to get together. Mahou no Iroha! is more comedic and has some bits of fanservice, Tenshi no Okurimono is just a oneshot, but doesn't feature any fanservice.