The anime was okay. It didn't hint as much at the Shin x Yankumi thing though, although, it did subtly hint at it, imo. The final episode of it, I felt it was obvious that Shin liked her, especially when he made that statement to Shinohara, "You were late." I guess by that, he meant that he wasn't there to fight for Kumiko's sake dealing with that gang Kudou was involved with. Shin also figured out that Kumiko liked Shinohara because when he was carrying her on his back, after that fight she was in, she was talking in her sleep about Shinohara.
Oh, there is another part that was pretty cool (not sure if it's in the manga or not since I haven't gotten that far into yet). Kumiko was asleep, and she woke up with Shin right over top of her. She woke up to see his face. "Oye, Yankumi, be quiet.." she then pinned him down and was started shaking him, and Fujiyama woke up and got the wrong idea since it looked suggestive!! It was hilarious! "Do you want two hours, three hours? Oh I love young guys." Hilarious reactions with those two. It was during the school trip. It was in episode 8 I think.
Edit: I decided to take a screen shot or two or 20...of it.
Since I took more than I realized, I put it in a zip file and attached it. Still it was funny when you heard the two arguing in the background and they were showing Fujiyama sleeping, and then she woke up and saw those two, and they were breathing hard, disheveled and stuff, and she was insisting on going out in the hall, and assumed that Sawada could go for 3 hours and she was all "Great!!!"...but was soon interrupted as the others were in the doorway (Uchi, Noda, and Kuma, I think).