From Chibi Manga:

Kaji, Yuzuha's unrequited love, is a good friend of her twin brother Suguru. He's the same age but goes to a different school and since elementary school, he's been going in and out of Yuzuha's home. She's been in love with him all this time, but can't make a serious face when around Kaji. Now they both change to the same high school and there's the chance to decrease the distance between Kaji and her...?!

Compilation of 5 stories:

1. Kataomoi no Mukougawa
Azusa knew the boy in the library was already in love... So what can she do when she starts to fall for him?

2. Ano Kado o Magareba

3. Tenshi ga Kuretamono

4. Bitou na Koi
A boyish girl who hates coffee and a quiet guy who likes girly girls, or does he?
(Source: Aerandria Scans)

5. Kimi to Natsu no Aizu

From Chibi Manga:
Shino was living in peace in the countryside until the day she met Kento, a boy coming from Tokyo.
Black hair, glasses and smart, that boy might be unsociable but he’s nice and Shino can’t stop her heart beating very fast when she’s with him… That’s the beginning of their love…

Senior high school student Mirai is surrounded by good-looking guys. One day, a mysterious fortune teller foretold that she would marry one of 3 guys… with whom does she share the red string of destiny…?? (Source: Chibi Manga)

Minako entered in the same high school as her friend Shuu. And then she figured out that one of her classmate is the guy she loves: Takuma. She will have to make a choice between love and friendship.
(Source: Chibi Manga)Included one-shot:
Volume 2: Sakura no Kioku

The two that wants to be closer. It is the heart they want to close the distance. A love story of a sweet adult romance...starts.

Compilation of 5 stories:
1. Kataomoi no Mukougawa
Azusa knew the boy in the library was already in love... So what can she do when she starts to fall for him?
(Source: Which Scanlations)
2. Ano Kado o Magareba
3. Tenshi ga Kuretamono
4. Bitou na Koi
A boyish girl who hates coffee and a quiet guy who likes girly girls, or does he?
(Source: Aerandria Scans)
5. Kimi to Natsu no Aizu

This is a deleted entry. The real entry is here: https://kitsu.io/manga/koi-no-naranai-wake-wa-nai

From Chibi Manga:
Her graduation ceremony is approaching. Because she wanted something else, she decided to break up with her boyfriend, but...

Sawaguchi Ruka, is 20 years old and is a 2nd year at a techinical school. During high school she was hurt by "her first love" and after that she has not been able to start a new romantic relationship. At that time, by accident she met a "Soushirou" a guy that was trying to pick her up—at the beginning she thought that he was irritating but, her "pain" disappeared and she started feeling excited and without knowing it, it turned into love. But, there was one thing she didn’t know. You’re "16" years old.
(Source: Chibi Manga)
Included one-shots: K no Ouji-sama; Osawagase na Kanojo

The top most popular boy and girl in the grade: Hashida-kun and Kaneishi-san. No one knows if they are dating but, they look good together and rumours never cease to follow them. Chiyo recklessly harbours an unrequited love for this Hashida. She becomes acquainted with Hashida as their seats are next to each other and she also discovers that Hashida harbours an unrequited love for Kaneishi. However, Kaneishi also harbours an unrequited love for someone else――

Here, young people, girls and boys, are living under the same roof. Mahiro is living with other people for the first time and everything is making her nervous and exited! Will her destiny will change? Will she find love? Or something else...?

(Source: Chibi Manga)

A girl being anxious of her relationship with her boyfriend since there is still no progress.

(Source: MU)

A collection of short stories:
1. Tsumi Koi
Yashiro witnessed Maki, a classmate who is popular with the girls, with another girl who wasn't his girlfriend. Tired of her uninspiring days, she decides to become Maki's "lover," but she gradually becomes charmed by him and she can't stop herself from falling in love with him! (Source: MangaUpdates)
2. Koi ni Ochiru Made
3. Yume de Aimashou
4. Kingyou no Namida
5. Koi no Jyumon
6. Tsumi Koi Bangaihen
Bonus chapter for the first story.