Well if i'm not wrong on the first 2-3 chapters of the manga,it was said by Adelt and Raku's dad that Chitoge and Raku should've stayed together for 3 years and right now the second year is nearly at its end(its the first week of january end the second year ends in may but based on the first two times between this period will be less then 10 chapters,i presume 6-7). Also during last school trip in Kyoko(if i'm not wrong) both Chitoge and Kosaki(the worthless character in nisekoi) declare that this year(the one that just started) will be "the one" !!! The first year lasted 60-70 chapters,the second one will last approx. 120 chapters(nearly 110 till now) which makes me think that the third(and last one) will last approx. 130 chapters of a total of 300 chapters! My guess is Raku will get together with kosaki(probably the dumbest thing it could happen) and that's because he keeps getting closer to her every 3-4 chapters(which honestly makes no sense since he left her hand during school trip to go look for chitoge and NOW didnt give a f*ck about the pendant just to get with kosaki). I suppose the girl that shows off ten years ago is chitoge(it makes no sense of being yui and it couldn't be marika since she states that she met raku in the hospital and he meets "that girl" outside and same goes for onodera since it's said that it was raku who would've taken her outside her house)
One more thing...my guess is that the writter first was about to choose chitoge "the one" whom raku would've ended up with but after season 1,the manga/show turned 180 degrees and onodera is the chosen one and that's "thanks" to her popularity based on the polls made by the manga. Definitely i think i will drop this manga,it's getting dumb...