Why is Toru Kouno receiving such an overly warm welcome at his new all boy's school? He has yet to discover the secret system called "Hime (Princess)" in effect at the school. Boys who are chosen have to dress up as a girl in every school event! Little does Kouno know that he would be the chosen one... 
(Source: DMP) 
Volume 3 contains the one-shot Train x Princess, of which the second (and final) part is included in volume 2 of <a href="https://anilist.co/manga/38106/TrainTrain/">Train☆Train</a>

When beautiful Tooru transferred to an all-boys school, he received a warm welcome...but little did he know that his new classmates had nominated him for the academy's "Princess System." The lovely campus "Princesses" must dress as girls (in frilly Gothic Lolita costumes) at school events in order to lighten the stolid masculine atmosphere. Tooru balks at first, but soon comes to realize the advantages of being a "Princess."
 
(Source: Anime News Network)

The new school year is here! Fujimori Academy students Kiriya Matsuoka and Tomoe Izumi have been chosen as this year&rsquo;s princesses, but it&rsquo;s going to take a lot of hard work to bring them up to speed. Enter former princesses Kouno, Shihoudani and Yutaka for a bit of princess training! Although Matsuoka and Izumi seem willing and able to take over the job of dressing up as girls and cheering at school events, they&rsquo;re not exactly what you&rsquo;d call &ldquo;friends.&rdquo; In fact, they seem to be about as opposite as two people can get. This animosity spells trouble for a student body that depends on their princesses to give them a warm, glowy feeling all year long. Can President Sakamoto and the ex-princesses convince Matsuoka and Izumi to bond for the sake of the school? Or will it take more than a common experience to bring two very different people together? 
(Source: Dokidoki)

Asahi Saruta has worked hard to realize his dream of working as a train attendant at Minami Kitazawa Station. The naive Asahi is unaware, though, of Minami's policy to hire only the most handsome of attendants. He finds this out quickly, when he meets his co-workers for the first time and sees that they are all sparkling beauties!
 
(Source: DMP)

Contains side stories from Princess Princess, Train&#9734;Train, and Color.

Meet the Sakamotos...a typical, upper middle class family of six with one peculiar quality-namely, they're all uncannily good-looking! That is, except for one member of the clan-14-year-old Akira. At that awkward stage where teenagers feel out-of-place in general, Akira believes he's average in the looks department, which simply doesn't measure up. How can he be around his family when he feels like he's being judged against them all the time? Will Akira's complex about being "different" cause him to turn away from the people who love him most? 
(Source: Digital Manga Publishing)

Meet Megumi! She's petite, adorable, and a total eye-catcher. In fact, she reminds almost everyone at school of the very elite (and very missing) boy student Kei Yoshikawa. Whispers and wild rumors begin to run riot from the hallways to the exclusive school rooftop...and the most powerful clique on campus has their sights set on sweet Megumi, too. Can her good friend Makoto shield her from a showdown and help her "skirt" the issue? Are some secrets just too big to keep? 
(Source: Digital Manga Publishing)
 
Note: Chapter count includes an omake.

Short omake episodes included on the Blu-ray/DVD volumes of Princess Princess.

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