Sekainohate De Aimashou

Yano Ryouma is an average boy who is bullied by his classmates by forcing all the boring work onto him. When half the school is destroyed in a freak incident he finds and helps a man named Emilio who is trapped under debris from the collapsed school (caused by Emilio's Cool Gate malfunctioning). Ryouma sacrifices himself to protect Emilio during a landslide and while Ryouma is knocked out, Emilio slips him a potion that turns him into a girl, and now he is the consort of the heir of a Magitek-filled space empire resembling a Medieval European Fantasy. Hilarity ensues as Emilio repeatedly attempts to court Ryouma with the latter desperately seeking to return to his original self.

Tropes used in Sekainohate De Aimashou include:

Alpha Bitch: Alicia, a princess from the alien empire Titania, was introduced as such. After some Character Development, she appears to be heading to Lovable Alpha Bitch territory though.
Arranged Marriage: Emilio's original intention to travel to Earth was to find a suitable candidate as his consort so as to stave off persistent proposals of political marriages.
Attractive Bent Gender: Ryouma.
Bifauxnen: Alicia's head of staff, Camilla, seems to be this. The only hints that she's not a male are the name and that the rest of Alicia's employees seem to be women as well.
Brother-Sister Incest: Used to be Brother-Brother Incest before the Gender Bender. One-sided on Yuuji's part of course.
Cain and Abel: Emilio became the heir to the throne when his older brother, the first born, tried to kill him in an attempt to safeguard his position but failed and ended up being killed instead.
Chronic Hero Syndrome: The quality of Ryouma which drew the attention of Emilio, who then became completely enamoured with Ryouma.
- Yuuji also shows some shades of this, suggesting that the quality might run in the family.
Cool Big Sis: Ryouma, at least through Yuuji's eyes.
Double Standard: Played With. When Ryouma insist on wearing only underwear indoors in a hot summer day, the rest of the household pleaded him to reconsider, only to be rebutted with the fact that they are doing the same as well. In the end Ryouma persisted in his way just to spite Emilio.
Fan Service: Too much to count.
Gender Bender
Human Aliens: Most of the aliens featured are of this variety.
- If they're not Space Elves.
Insignificant Little Blue Planet: Earth is viewed as such by Emilio and the rest of the aliens.
Jerk with a Heart of Gold: While Emilio is very self-centred and has no qualms on turning Ryouma into a girl so that he can marry him against his wishes, he genuinely cares for Ryouma and would take extreme measures to protect him.
Laser-Guided Amnesia: Yuuji suffered from this after an accident, causing him to mistake Ryouma as his girlfriend and even tried to be intimate with him. After he recovered his memories, he lapsed into a Heroic BSOD and even attempted suicide. Thankfully, he was saved by a passer-by.
Magitek: The space empire is powered by a force known as "mana" and so far, only members of royalty are shown to be capable of directly utilising this force.
Portal Door: Inter-dimensional gates (which appear as giant doors) are the primary mode of transportation in the alien space empire.
Promoted to Parent: After Ryouma and Yuuji's mother died while they were both young, Ryouma ended up taking over most of his mothers household duties.
Selective Obliviousness: Ryouma refuses to view Yuuji in any way except as an innocent little brother.
Sibling Yin-Yang: Ryouma's a lot calmer while Yuuji's more outspoken.
Stupid Sexy Flanders: Ryouma discovers that he actually used to induce some amount of this in the boys at school. After actually becoming a girl, they all openly and unashamedly compete for Ryouma's favor.
- Ryouma does have this reaction towards Emilio a few times, especially when considering the idea of becoming a mother.
Super Mode: Alicia and the rest of the Titanians can turn into giants when they are enraged. Alicia especially hates other people seeing her in that form though.
Supreme Chef: Ryouma.
Unsettling Gender Reveal: Ryouma to Haruki, a friend of Yuuji.