Short manga volumes that were bundled with disc releases of anime adaptation. Each focuses on one of heroines.

I was never curious about my girlfriend's past...until that incident! Now I'm just dying to know! Who is this ex-boyfriend? Why is he acting so friendly? What happened between them in the past?! It sure isn't your typical love triangle.

On the night of Tanabata, an alien called “Maekawa” suddenly appeared in front of Mitsuru. He, who came from far away, tries to help Mitsuru who is longing for her childhood crush…

From Broccoli:
The Angel Troupe is composed of five beautiful and talented female pilots.

When a coup d’état threatens the life of Prince Shiva, they are called to action. Takuto Meyers is put in charge of the Angels and is ordered to escort Prince Shiva to safety.

With their enemy right behind them, Takuto and the Angels have enough to worry about—but multiple love triangles don’t seem to be helping!

Hoshino has to transfer, and rumor has it, that one of his new colleagues is gay.
source: MAL

From Nevermore Scans: For the very first time, a serialization that’s published in China and Japan simultaneously! A love adventure drawn by China’s top shoujo manga artist! “You will never be able to get a boyfriend for as long as you live!” Chiyo Ren is a very unfortunate girl who got put under a spell when she was a child. Sure enough, up until the present, she has never managed to get a boyfriend. The only person who can break the spell…is the malicious, ikemen, ‘Kamisama’…!?

“Use me as much as you want as if you’re doing it by yourself…” Mutou, a university student, just started to live alone for the first time. In his new place, he met his next door neighbor, Uematsu, a translator living in a really old house haunted by the past. In a time where flowers are in full bloom in spring, Mutou begin to feel happiness and attraction from spending time together with Uematsu on his porch.

However, Mutou came to hear that Uematsu had someone important that he can't forget...

Will Uematsu be able to open up to Mutou at the end?
A slow brewing sweet romance begins now!

From Ochibichan:

A cafe worker with an icy cold smile; A kouhai who will get attached to you like a puppy; A prince-like person who has erythrophobia (can't stop blushing); and a childhood friend who has suddenly become very good looking... All the best guys around! Who would you choose to spend your night with?

In this volume are the following short stories:

• Paradise Cafe
Emi is a girl who works at a cafe full of hot guys. She’s dating Matsuda, the waiter with the number one amount of fans there. Their relationship has to be kept a secret, because who knows what the fangirls might do to her if they found out? And now Emi is worried that Matsuda doesn’t really love her…
- Aerandria Scans

• Unlucky Start

• Maigo no Prince

• Second Chance

• Chika Chika Night Sky

Tsubasa, boyfriend less, 18 and just failed her college entrance exams gets a job tutoring the son of her mother's superior. He's handsome, smart and perfect boyfriend material but he just so happens to be younger than her. So, she plans to make him into the perfect man! She then makes a list of qualities he should have but what happens when the one person who isn't supposed to see it sees it? Tricks her into something? And then uses it to blackmail her?

Contains a Oneshot/Omake that Chibi Scans will not do.

To please his crush, Kunishige Yuu, an ordinary middle schooler, stole his brother’s invitation to a photography exhibition. However, he never would have thought he’d encounter an intimidating long-haired guy at the very place, who seemed to be his brother’s acquaintance… or even more than that, his brother’s ex-boyfriend…?

From ShoujoMagic:

Living in regret that his formula gave birth to the atomic bomb, Professor Einstein sends two boys whose eyes can see the future on a train that travels at the speed of light before embarking on his own final adventure: death. His hope is that they will find "HER" and tell her his wish, for it is only she who can grant it.

Fifty years later, it is 2005 and the place is Tokyo. At last, "SHE" (Ruika) has been found... but Ruika has an unusual circumstance. For her mother's sake, she's been living as her dead brother since childhood. Does Ruika truly have the power to grant wishes? If she grants her mother's wish by becoming a boy, then no one can lead us into the GLOBAL GARDEN... Now it's a race against time and against each other, because everyone has a dark past and an ulterior motive for possessing the girl who can grant Einstein's wish.

N/A

Ogawa Tomoo, a high-school boy, who can't figure out why his classmate, Oomori Yuka, likes him so much. Unlike him, she's friendly, upbeat, excels at sports and is one of the most popular students in the school. Tomoo doesn't understand why someone so attractive would be interested in someone like himself. He decides to push Yuka away for her own good but her persistence eventually pays off and he can not help but be attracted to her.

An omegaverse story about an insecure omega with a kid and an alpha who doesn't want to date omegas in fear of himself.

A collection of 12 short stories, including:

She, her, her, hers: by Otosaki Tsubaki
Sakuya is shaken up by her parents' divorce and is worried that her relationship won't last forever either. Her lover, whose parents are also divorced, understands her feelings and tries to reassure her.

Endless Narcissus: by Otosaki Tsubaki
The protagonist wants someone who will love her and her alone, so she gets a clone of herself.

Hidden Meaning: by Itou Chika
A writer and an editor who are lovers. The writer keeps basing characters on her lover, and the editor wants her to stop because she's afraid that people at work will find out about their relationship.

Maintenance: by Itou Chika
A woman fantasizes about the mechanic who works next door to her office building. These fantasies involve being the car the mechanic is fixing.

Matataki is a high-school student who enjoys photography. One day, he finds out that he can see the future when he looks through the viewfinder of his camera upon seeing the girl he likes, Mirai, kissing a stranger under a bell that is rumored to bring two people together for eternity...

A car accident kills little Julia's parents, eleven years later, she returns to the site behind the truth and searches for the father's past. But when his powers start to get out of hand, she finds an old friend can help... .......... Original series in Portuguese

Ery was living her ordinary, dull high school life until one day when she saw a guy in the park. Curiosity made her follow after him, and she reached a skating school. Unhesitatingly, she joins the school, but…

Contains an unrelated story Summer Fairytales aka Summer's Fairy Tale (also included in Bathroom Guuwa as chapter 3).

Haruka Ikeda always tried to avoid a life of cliches due to her "heroine" like appearance. However, Haruka has a burning desire to live life as normally as possible! But when she starts her first day of high school, it seems things won't go her way so easily.