This series is a prelude to the relationship between Sakisasa and Hatori, their ups and downs. What sets this series apart is the fact that each scene is shown twice--once from the girl's point of view and then the guy's.

Kiss, Zekkou, Kiss Bokura no Baai (Sequel)

From Aerandria Scans:
“Won’t you become my girlfriend?”
On the day of her high school entrance ceremony, Ao got asked that by Riku, a guy that she has only just met. But by that, he meant to ask her to become his fake girlfriend, just to pretend. Ao was surprised by the sudden request, but after knowing Riku’s true feeling, she decided to agree to become his fake girlfriend...?

1) 37℃ Kissu - Naoki was a very cool and good looking guy, but somehow after meeting Fumika-chan, he's not cool at all, but very cute?!

2) Secret tears - He saved his second button for her, but on their last day, she handed him a love letter to give to his best friend. Instead of delivering that letter, he kept it himself, and asked her to go out with him instead...?

3) Caramel Kiss - Atsushi-sensei is Kawahara's first love, will he be able to accept her affections?

4) Shounen Knife - Until Riki moved in, the house next door to Mimi's was always vacant. Riki saved Mimi's cat, but it seems that he isn't as well mannered as she first thought?

5) extra from Kiss, Zekkou, Kiss Bokura no Baai.

From Baka-updates

1) 37℃ Kissu - Naoki was a very cool and good looking guy, but somehow after meeting Fumika-chan, he's not cool at all, but very cute?!

2) Secret tears - He saved his second button for her, but on their last day, she handed him a love letter to give to his best friend. Instead of delivering that letter, he kept it himself, and asked her to go out with him instead...?

3) Caramel Kiss - Atsushi-sensei is Kawahara's first love, will he be able to accept her affections?

4) Shounen Knife - Until Riki moved in, the house next door to Mimi's was always vacant. Riki saved Mimi's cat, but it seems that he isn't as well mannered as she first thought?

5) extra from Kiss, Zekkou, Kiss Bokura no Baai.

Continuation of Kiss, Zekkou, Kiss, a shoujo manga following the relationship between Sakisaka and Hatori—the ups and downs, misunderstandings, the tears and the laughter.
A unique thing about this series is that each story/situation is told twice—once from the girl's perspective, and once from the guy's perspective! The reader ends up learning what each side was thinking.
(Source: MU)

From JShoujo Scans:

"I absolutely won't fall for this brat!"

Due to job transfers, Makoto has no choice but to stay at the home of her father's friend for the time being. But there lives a boy who makes her boiling mad!? Turns out he's the king of popularity at school, but he's a prankster who likes to mess with Makoto, and even recently dumped one of Makoto's good friends! How is Makoto supposed to handle this obnoxious brat!?