Dedicated to one of the best anime parings ever, Ryugu Rena and Maebara Keiichi. They are perfect for each other and the evidence is all around.
0. This short..... fanfic?.... Not written by me >_<!:
1. Just watch Onikakushi-Hen...
1.a. They are the two main characters and most of the dialouge/interaction is between them.
1.b. Rena is the one who holds him down when he gets stuck with the needle.
1.c. Keiichi beats Mion to death first and then saves her for last.
1.d. As he beats her, she smiles and opens her arms to him saying, "I belive you". (As seen in the original game and the manga version.)
1.e. Keiichi tries extra hard to save Rena's Kenta doll. (In the game we see just how difficult it was for him to get it out).
1.f. How could any of us forget the 'Maybe' Kiss from episode 3? 
2. Tsumihoroboshi-Hen... 
2.a. Keiichi is the only one Rena doesn't tie up.
2.b. While on the roof Rena and Keiichi both say that thier prize will be the other one saying 'Good Morning' and 'Good Night' to them everyday.
2.c. Keiichi also says he wants Rena to be his maid ~_^
2.d. After Rena nearly, I don't know, tires to kill him, he still holds her on the roof.
2.e. Keiichi also said if Rena won he'd beleive her story about Mion and the Sonozaki's being evil. Guess what? Rena won.
3. Watanagashi-Hen......... 
3.a. Keiichi gives Rena the doll.
3.b. When Keiichi finds out that Satoko and Rika have been killed/disapeered, Rena is the one that goes to comfort him and he doesn't apear to have any problem crying in front of her, or lettting her rub his back ~_^.
3.c. Rena is the one in the police car with him in episode four, and thru the whole ep. her main concern is his safety.
4. Tatargoroshi-Hen......
4.a. They say Rena will make a good bride one day. I don't hear them giving that kind of compliment to anyone else....
5. Nekogoroshi-Hen...... 
5.a. The picture speaks for itself ~_^.
6. Yakusamashi-Hen.....
6.a. Rena gives Keiichi her lunch to make him feel better ^__^.
7. Their character songs were released together on one CD. (As in, just thier songs, none of the other characters were on it besides Oiishi).
8. In Higurashi Kai, one of Takano's men attacks Rena from behind but he saves her and says, "Watch your back" and she replies with, "I'll leave that to you."
9. Also in HiguKai, when Keiichi is dying, Mion grabs his hand and tries to get his attention, but instead he turns to Rena and says his dying words to her! Then as they are running away, it closes in on Rena's heartfelt tears, not Mion's.
10. In the video game Higurashi Daybreak, the first team you can choose to play as is "The Protagonists Team". This team is of Keiichi and Rena. And if you win as them, they are both blushing all thru the cutscene ^///^.
11. These Fanfics ^^:
http://www.fanfiction.net/s/3781776/1/That_Night_on_the_Roof_Remember (Rated G)
http://www.fanfiction.net/s/3794404/1/Tragedies_Written_in_Blood (Rated PG-13)
http://www.fanfiction.net/s/3781779/1/Blades_Versus_Bats_Only_Love_in_the_Latter (Rated Mature, for Violence)
http://www.fanfiction.net/s/3603095/1/Hot_Liquor (Rated Mature, for Violence)
http://www.fanfiction.net/s/4050765/1/Blood_Stained_Love (Rated PG-13)
12. The Doujin I moved from this page to "Pictures". (Taking Rena. Moved for Space.)
13. This Screenshot taken directly from the English translation of the game. (Keiichi is the one speaking): 
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Higurashi Personality Test:
http://www.quizilla.com/users/OnlyANobody/quizzes/Which%20Main%20Higurashi%20No%20Naku%20Koro%20Ni%20Character%20Are%20You?
-Yay! I got Rena! Any of you boys get Keiichi? ~_^-
You are Rena! You are about as adorable as adorable can get, and you could never resist anything that you consider cute. However, you could tend to be a bit scary when you're angered. You act optimistic most of the time, but you hide a sadness which you never show to anyone.
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Picture Links:
Rena: http://bad-end.org/kareha/kareha.pl/1174372788/l50
http://z6.invisionfree.com/Hinamizawa/index.php?showtopic=111
http://s261.photobucket.com/albums/ii66/Dreamiel/Rena-%20Cute/
http://s261.photobucket.com/albums/ii66/Dreamiel/Rena-%20Creepy/ 
So joining~
