This is a sequel for To Love-Ru. It can be read as a standalone, but character development in the first makes this story much better.
The sequel sees Rito, acknowledging his love for both Lala and Haruna, continue on ecchi asventures. The sequel is really pushing what I'd expect from shounen ecchi. While it has no genetalia, it makes very liberal use of breasts and is very stimulating, more s than even some hentai I've read. This goes too far at times but generally is a boon. The one problem is chapter 5/6, I have yet to be more horrified at an ecchi scene in any manga and believe those two chapters alone partly soil the rest of the manga for me.
In addition the sequel is more plot focused. The first half focuses on Yami's confronting her past as a weapon and trying to find inner peace and understand her feelings for Rito. The second half puts more focus on Rito and the efforts of Momo, the younger sister of Yami, to make a harem. Having any plot at all made the story better, giving me greater stakes to follow.
The ending is an insult. Every development by Momo and, later, Nemisis pointed to a harem ending. Rito already loved both Lala and Haruna. Haruna got far too little focus for her to be anything close to Rito's choice of love. Yet that happened, Rito rejecting the harem for his love of Haruna. This ending did not get nearly enough runtime to be remotely justifiable. I spent two hundred twenty chapters waiting for a completely indecisive ending? If they emphasized Momo's inner doubts about harem and had Rito disagree with harem based on that, I would accept the ending more because Momo earned my respect based on the story's focus on her. But Haruna? Laughable. Plus, I really wanted to see Rito in Deviluke even once, coming with his harem to confirm his marrige to Lala with the other characters as his co concubines.
To sum, the story did everything to advance a harem ending, so not having this is insulting to me as the reader.
A fantastic story with top quality ecchi, but the ending will hit like a hammer.
7/10.