In Soredemo Ayumu wa Yosetekuru, Ayumu is in love with Urushi, one year older, but he has sworn not to confess his feelings until he can beat her at the board game shogi.
In Hoshi no Samidare, Yuuhi is your average college student, at least until the day he wakes up and finds a lizard in his bed who claims he must save the world.
In Saikin Yatotta Maid ga Ayashii, Lilith was hired to look after Yuuri, and seems too good to be true. Food is delicious, the residence sparkles and his clothes smells nice.
In Tsurekano, Yume and Mizuto dated in middle school but broke up. Shortly after, they are shocked to discover that their parents are getting married.
In Kuro no Shoukanshi, Kelvin learns that he bartered away his memories in exchange for powerful new abilities in a new world, and that Melfina, a goddess is with him.
In Yofukashi no Uta, Kou stops going to school and begins slipping out to walk the streets at night, there he meets Nazuna, who ends up being a true vampire.
In Kinsou no Vermeil, Alto is on the verge of failing the summoning magic class and having to repeat the year, stumbles with an old magic book and ends up summoning the demon Vermeil.
In RWBY: Hyousetsu Teikoku, the world is plagued by deadly monsters known as the Grimm. Huntresses protect humanity, Ruby, Weiss, Blake and Yang are among them.
In Teppen!!!, Yayoi enrolls in a private High School, famous as a starting point for new comedians, she reunites with Yomogi, a childhood friend and meets Yuzu.
In Isekai Meikyuu de Harem o, Michio was wandering the Internet, when he finds himself transported to a fantasy world, becomes an adventurer and gets the right to form his own harem.