Yuuki first met Kotonoha at the school library in the beginning of second semester, but there was no progress with their relationship. They just frequently came to the school library... One day, he sees Roka at the school library and he meets her again through his older sister, Chie, on the same night. Yuuki gradually falls in love with Roka. Roka is also attracted to Yuuki. Their love, however, doesn't go smoothly...
Yuuki hears a rumor that Roka is in love with Makoto. Later he hears that Makoto is close to another girl... Yuuki decides to ask Kotonoha, Makoto's girlfriend, about it to make it clear the fact. From that day, Yuuki's eventful school life starts...
I'll let it be since it has a presumably all-age PSP version and there are English reviews.
2. Dosukoi! Onna Yuki Sumou ~Mune ga Dokidoki Hatsubasho Taiken~ どすこい！女雪相撲～胸がドキドキ初場所体験～  Liar-soft
Tanpopo is a female Sumo wrestler. She enters university and joins the female Sumo club, which is famous for a strong Sumo wrestler, Sayuri. But Sayuri says, "If you're not a virgin, you won't be able to join the club!!"
Though Tanpopo has a boyfriend, Hiro, she is still a virgin. She is somehow allowed to join the club, but she is totally confused with the customs of the club. Also, Hiro persistently tries to have sex with her.
Will she be able to protect her virginity? Will she be able to become a strong Sumo wrestler?
Such madness could only be undertaken by Liar Soft. As usual it's half-stupid, half-spontaneous H. Length is short, and additional nuisance gameplay elements are introduced to hamper progression.
3. Burst Error: Eve the 1st バーストエラー イブ・ザ・ファースト 
Remake of Eve Burst Error.
Remake that's exclusive to PSP.
4. Happy Wardrobe  Shallot
When Meito was a child, he was forced by his parents to dress as a girl sometimes. Because of this, he really hates making clothes and cosplaying in general (especially as a girl). However, he aspires to join the drama club at Yuuei Gakuen and starts sewing costumes by himself. The next spring, he decides to join Sono’s drama club when he enters the school, but it was closed since it didn’t have enough members.
Main character dresses as a girl and participates in drama club. Just a banal disappointing debut work.
5. Saki Portable 咲-Saki- Portable  Alchemist
Popular anime and manga series Saki comes to the PSP in this mahjong-themed bishoujo game! Join Saki and her school mahjong teammates Nodoka, Yuuki, Hisa, and Mako, as they play together competitively and try to reach the high school national mahjong championships! Primarily a mahjong game, the player can also enjoy all of the unique girls' personalities and player strengths, from Saki's intuition to Nodoka's computational skill and Yuuki's love of tacos (yes, she gains mahjong power while eating tacos). Play through the game in "story", "challenge", and "free" modes, with unique styles of play from each, from being able to customize your mahjong teams to unlocking fanservice CG featuring the cute girls in the game. Enjoy mahjong with Saki today!
Anime spin-off with cards
6. Sora no Otoshimono: DokiDoki Summer Vacation そらのおとしもの -ドキドキサマーバケーション-  Kadokawa Shoten
One summer day, the memory network of Ikaros is suddenly initialized.... Tomoki and his friends try to give her shocks through various experiences. Will her memories and emotions successfully come back...?
7. Cure Mate Club  Atu Works
Hiroto becomes a replacement teacher at Shuuou private girls’ school, the leading school in Japan for young ladies. Within this school, there’s a special place run by the students for themselves, a place where the maidens of high society mingle. This is Cure Mate Club. The owner of the club, Erina, meets him and makes him dress up as a girl.
Second candidate for the most banal synopsis of the month. Realization is much better though, but I'm not seriously discussing trap Pia Carrot or whatever.
Seigo came to the quaint island of Kamina-jima a few years ago from Tokyo. He’s apathetic about everything and gives up easily. News breaks out that the school will close down after this year and some of the girls decided to petition against it. He thinks that if he helps them, then maybe they’ll like him and things won’t be as boring!
There are English reviews.
9. Maximum Magic: Quirk of Destiny  Lime
One day a castle fell from the sky and soon strange things began occurring around the area. The queen chose a young boy to investigate into it. While he is definitely smart and capable of great things, his personality is… well, a little off. He doesn’t follow orders well, doesn’t have common sense and likes playing tricks to scare people.
It's more of a charage, but with battles. The worst part is that all individual routes end abruptly without revealing anything. It's natural to expect a true route, but there is none. With so many questions piled up it's impossible to give real evaluation unless there's a sequel or something.
10. Natsu ni Kanaderu Bokura no Uta 夏に奏でる僕らの詩  Purple Software
When Haruka was small, he was friends with many girls. One day, those girls played a secret game amongst themselves and one of them never appeared after that game. Many years later, while enjoying the sea, he meets a girl who he thought was a mermaid. She was Kanon, the girl who had left them back then. He calls out to her, but she doesn’t acknowledge knowing him.
All heroines are deredere childhood friends, so there's no real "capture", all are in love from the start. So SOL scenes and flirt take up all the time. Guess it's only for Purple Soft fans.
11. Re:Seven -Boku ga Kimi ni Dekirukoto- Re:Seven 僕が君に出来るコト  Lilac Soft
One night, a girl suddenly appears in front of Naoya when he is on his way home.
"I'll erase you in seven days."
Since he doesn't know who she is, he just ignores her. He comes back home and goes to bed soon.
Seven days left...
Basically, protagonist uses this time to run away with one of fellow workers, so setting is opportunistic. Length is short, so there's just not enough content. Composition is looped, so after all laps there's the outcome.
12. RGH ~Koi to Hero to Gakuen to~ RGH～恋とヒーローと学園と～  Chien
Rinou Gakuen is a huge school with over 10,000 students. Iwao has been unlucky: being mistaken for a thug when he wanted to help the girls in trouble, getting in fights with the ‘school hero’, his dorm being a dump, etc. One day, he saw some students being attacked and he wanted to help, but... he can’t just help them as is since he’ll be thought as the culprit again. He decided to use ‘that’, and that was the beginning.
Transformation bakage that feels terribly short due to absence of everyday depiction. Typical Chien - funny concept, but unpolished realization.
Saki finally made it into Soushin Gakuen with the help and encouragement of his friends. Lifted by his achievement, he feels that it is just one small milestone in his life and he should do the most he can with his life. But everything won’t go smoothly. Together with the girls he meets at the school, he will make the journey to maturity.
There is a French review.
14. Subarashiki Hibi ~Furenzoku Sonzai~ 素晴らしき日々～不連続存在～  KeroQ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Subarashiki Hibi is a story told in seven chapters. The story follows a group of several Tokyo high school students mostly through July of 2012 and each chapter is told from the perspective of one of its five main characters. Because of the same timeframe coverage, certain events are overlapping from chapter to chapter but at the core of it all is a mystery revolving around the prophecy about the end of the world on July the 20th as well as the events that are following before the said date. The first part of the VN is used to make a setting for the said mysteries while the second part is about uncovering the truth behind them all.
The story begins in chapter #1, 'Down the Rabbit-Hole I" on July 12, 2012. The protagonist, Minakami Yuki, lives a peaceful everyday life with Tsukasa and Kagami, her childhood friends, when one day she meets a mysterious girl, Takashima Zakuro (a girl in another class in Yuki's school, who seems to have met Yuki before but Yuki doesn't remember her). The strange schoolmate Yuki just befriended moves into her house (Yuki doesn't mind too much about that). Then following this new guest in Minakami's residence, Yuki's two childhood friends mentioned earlier also move in, just so that they don't feel left out. These events are just a prelude for what will ultimately lead Yuki to discover her own "Wonderful Everyday" during this chapter.
There are English reviews
15. White Album 2 ~Introductory Chapter~ White Album 2 ~Introductory Chapter~  Leaf 1 2 3 4 5 6
As if to match the guitar I play in the afternoon music classroom.
As if to match the piano someone plays in the next room.
The pure singing voice from the rooftop connects the three disconnected melodies.
It all started on such a day in late autumn.
At that time, someone fell in love.
Everyone was doing their best. Everyone pushed on. Everyone was intent and honest…
We formed a bond and obtained a precious moment.
That’s why someone fell in love. A love that was too late, a love that shouldn’t have occurred.
And then comes winter. The falling snow covers all sins.
And spring eventually comes, melting the snow and imposing all punishments.
There are English reviews, although those suit Closing Chapter much more as I remember Introductory Chapter to be unforgivably short
1. Chaos;Head Love Chu☆Chu! カオスヘッド らぶ Chu☆Chu!  Nitroplus 1 2
Summer finally comes to Tokyo, and Takumi can hang out with girls as much as he wants... in his mind. His will to stop being a useless otaku creates a dream world where the girls love him, and the only way to destroy this reality is to kill Seira-tan. But until then, Taku can enjoy his dating-sim life!
Reiichi lives a peaceful life with Uko, his childhood friend, and Koinu, his younger sister.
But one day, a mysterious girl, August, suddenly appears in front of him and says, "You, my Cthulhu!"
His life completely changes... Reiichi knows that he is actually her Cthulhu and gets involved in an epic battle...Nukige, but at least one with impressions and opening