Yeah…this was not a great adaptation if I am honest. The love meter gag, the whole point of the show, wasn’t even shown for some scenes (like when they are eating ice cream), and whole sequences from chapter 1 were cut. However, they made sure to insert an anime-original scene on the beach. I was really caught off guard when there was nudity in the show because it was not in the manga at all.

tl;dr - read the manga on this one. The art is better and the gags are funnier. Also, no forced fan service.