Nisekoi: OVA

Magical Girl parody. Higurashi Kira and Nisekoi S2 do have their magical girl parodies, that take the same generic plot route. You can expect the transformations to be similar to the general type and the battles too. Would recommend the original series if you are interested in them too. 

Magical Girl parody. Nisekoi and School Days both follow the seemingly common magical girl parody, they do a good job at executing them as such following the general standards quite well in multiple plot devices. The original series are similar too, with both being harem anime. 

Both shows are OVAs that were released outside of the original series. In essence, they both build off the harem genre to some degree. They also share practically the same plot (at least the first half of Nisekoi: OVA does): each of the main female characters have some kind of idealized dream involving the main male character.