Souta Hatate is a high school boy who has the ability to see flags that provide choices during important events in life, which also allows him to see the future. Souta decides to break the flags instead of dealing with them in order to distance himself from others so they won't be involved with him, having had bad experiences with it in the past.That changes on his first day at Hatagaya Academy, when he prevents people from dying in a lorry accident, drawing the attention of one of his classmates, Nanami Knight Bladefield. Nanami doesn't trigger any flags, so Souta can't figure out how to make her go away, forcing him to reveal his power to her.So begins a chain of events which results in Souta acquiring a harem as he tries to uncover the secrets behind his power.Kanojo ga Flag o Oraretara or Kanojo ga Flag wo Oraretara (彼女がフラグをおられたら) is an ongoing series of fantasy romantic comedy light novels that started in 2011 written by Tōka Takei and illustrated by Cuteg. It has a manga adaptation that is serialised by Monthly Shōnen Rival. There are two manga spinoffs: one called Kanojo ga Flag wo Oraretara: Ooyuusha yo, Flag wo Tateteshimau to wa Nanigoto da!?, which is in a RPG Mechanics Verse, and another called Kanojo ga Flag wo Oraretara: Root Love, which has as yet no info in English. The series will also have an upcoming anime adaptation in spring 2014.
Kanojo ga Flag o Oraretara provides the following:
A-Cup Angst: Nanami is rather insecure about her flat chest, especially when compared to Akane.
Always in Class One: Averted; most of the main characters go to class 1-F, save for Rin, who's a year ahead, and Kuromiko, who's in middle school.
Balanced Harem: Most if not all of the girls (and one guy) appear in every chapter and get an equal amount of interaction with Souta because they all live under the same roof. They also share equal amounts of fanservice and it's possible for any of them to win Souta over. It's one of the friendliest examples of a harem around, with the members largely treating it as a good-natured competition, and being willing to encourage each other in their pursuit. Souta knows how a lot of them feel - his power makes it obvious, among other things - but he doesn't feel in any position to reciprocate.
Beach Episode: In the twelfth chapter of the manga, a few members of the cast (Souta, Megumu, Nanami, Ruri, and Tsumugi) hang out at the beach.
Broken Bird: Souta. As the series continues, we discover that he's holding himself apart from others because his big sister disappeared, and everyone but Souta lost all memory of her. Souta believes it was because of his powers. Consequently, he tends to blame himself when bad things are in the offing.
Cool Big Sis: Kikuno is Souta's self-declared big sister, so she does sisterly things for him, such as making him lunches, giving him advice, and being a little too affectionate sometimes. She also acts like a big sister figure to the rest of the cast.
Dude Looks Like a Lady: Due to his very feminine appearance and attire(thigh high socks and shorts), Megumu is mistaken as a girl by many characters when they first meet him. The fact that he wears the male uniform (or at least the blazer) is the only way anyone could see that he was actually a boy.
Marshmallow Hell: In chapter 12 of the manga, Tsumugi accidentally subjects Souta to this after she tries to comfort him.
Meaningful Name: Most characters have a last name (or middle name in Nanami's case) that shows what role they have in the story.
The "Hata"(旗) in Souta Hatate's last name means "flag''.
Nanami Knight Bladefield is the princess knight.
Akane's last name, Mahougasawa, has "mahou"(魔), which means magic. It's indicative of her role as the magician.
Megumu's last name, Touzokuyama, contains "touzoku"(盗賊), which means thief.
Ruri Ninjabayashi is the shinobi of the group.
The "Eiyuu" (英雄) in Rin Eiyuuzaki's last name means hero.
The "Shoukan"(召喚) in Kikuno Shoukanji's last name means summons, referring to her role as the summoner.
Tsumugi's last name, Ryuukishibara, contains "ryuu"(竜), meaning dragon, and "kishi"(騎士), meaning knight - in other words, a dragon knight.
Mei Daimyozamurai is the samurai.
Kurumiko's last name, Daishikyougawa, has "daishikyou"(大司教), meaning archbishop, indicating her role as the cleric.
Mimori's last name, Seiteikouji, contains "seitei"(聖帝), which means holy emperor.
Meido: In the school's "Fancy Dress Sleigh Race", the group (including Souta) wear maid uniforms since wearing a dress is required in the contest. Nanami decides to wear a princess dress instead.
Miniature Senior Citizens: Subverted by Tsumugi. She was a fully grown adult who shrank as she got older - she just didn't age, resulting in her current appearance as a young girl. To her, this is perfectly normal. To everybody else, it's deeply weird.
Strange Minds Think Alike: Everyone who sees the way Tsumugi treats Souta over the beach arc reacts with "She's doting on her grandson".
Student Council President: Mimori takes her job as the school's student council president very seriously. She holds a lot of power in school due to her strong political ties with it and being the board chairman's granddaughter.
Tsumugi has this role because she looks like a little girl and appears to be the youngest member of the cast. But she's actually an old woman who might be even older than the school itself. She also acts as a mentor of sorts to the rest of the cast.
Kuromiko also has this role, as she's the youngest character in the cast and is treated as a little sister by Souta.
Training Montage: Chapter eight of the manga displays a montage of the rigorous training Rin made the gang do in order to prepare for the sports festival.
Tsundere: Nanami is a mild case in general. Akane attempts to get her to invoke it on one occasion on the grounds that it's "the most joyful thing a boy can hear!", but it just bounces off Souta. Mei develops into one as time passes.
Winds of Destiny, Change: Souta has the ability to see flags on top of people's heads, allowing him to see and change important events and choices in life. He can also break flags by taking action to prevent events he doesn't want to happen. He's not up on all the nuances, however, particularly when it comes to the way his friends' flags appear (or don't). Mei had a lesser form of the ability before she lost her memory.
Yandere: Rin has distinct tendencies this way, though so far she's been prevented from going full-on yandere.
You Gotta Have Blue Hair: Few characters have ordinary or plausible hair colours. Even some of the ones that do have normal hair colours have hair that's unusually bright:
Kikuno has bright lime-green hair.
Kuromiko has purple hair.
Rin has forest-green hair (when it's not stylised as black).