For high school girls there are some "battle days", for example Valentine's Day, Christmas, and...

An adaptation of Square Enix's smartphone "light novel-style RPG" app Schoolgirl Strikers. The game is set in Goryōkan Academy, a new private senior/junior high school for girls with a vast downtown campus. This highly popular school has "another face" — a secret hidden side. It organizes and trains the special unit Fifth Force to protect the world from invisible supernatural entities known as "Oburi" that are devouring the world. A team of five trained with powers against the Oburi is to be chosen from the student body to perform missions. A new team leader has been appointed to assemble​ the five students. (Source: Anime News Network)

A group of 5 male high school students that call themselves the funny-face group cause trouble at school with their crazy antics. (Source: AniDB)

This manga is based on the cell-phone rpg of the same name. Two children, Kiriru and Ignato, are born to a life of fighting. Their mother hopes that they will not end up having to fight alone. As a teenager, Kiriru does not like his assigned destiny, but he must fight monsters or many other people will die. Will he accept his fate, and will he ever find a partner? (Source: MangaHelpers)

There's an old legend that a monk and a Tengu (Heaven Dog - 天狗) is rival. Kiyomi is a monk who was saved by a girl named Sasuka. While staying there, he found out that there were girls who went missing. Villagers think the culprit is a Tengu. Is the Tengu really culprit? And somehow it seems that Sasuka relates with Tengu. And somehow Kiyomi is just a fake monk?

A group of scattered people who've lived sin-filled lives head off to battle once again after their deaths; each one harboring their own reason to fight. When the fighting is finished and their sins have been atoned for, their souls will be returned to them. Kanata no Togabito ga Tatakau Riyuu is an epic fantasy from a long anticipated new author, and the story of those who fight on and are burdened by the sins from their past.

Sakura Kouzuki, a top-tier gyaru who's the star of the class and even works as a reader model, and Houri Kazami, who prefers talking otaku stuff with his comrades in the corner of the classroom. These two, who seem to live in completely different worlds, are actually step-siblings—and secretly live together as a couple. And none of their classmates know the truth. While Sakura sparkles at school, once she's home she relaxes completely and falls head over heels for Ori's cooking. And Houri, who’s in charge of meals, doesn’t mind one bit—— “Simmered fish is sooo good~♡” “Onii-chan's cooking really is the best~!” A sweet and fluffy feeding story about a cute gyaru and their double life at school and at home! (Source: Square Enix, translated)

Humans are suited to be come a warrior of the Gods world. Once proven to be the holder of an honourable soul, a Goddess - The Warrior Virgin - will lead and show those the way into the Gods world, and yet dead, their souls will be given the opportunity to walk down the path of life. Necromancer, Lezard Valeth and his young apprentice Louie meet a "Hero" from a small town. Is he perhaps one of these honourable souls and what interest does Lezard have in him? (Source: Boku-Tachi)

working!! that focuses more on the daily lives outside wagnaria.

With her little brother in a coma and no money to pay a doctor, Milan has no choice but to turn to Clock and Chrome, Time Traders who grant wishes in return for hours instead of dollars. (Source: Kokoro no Oasis)