Timeline

Before Magical Noir Quest

(yb = years before)

60-70yb:Incubators arrive on Earth
9yb:    Xiaomei Baocun contracts to the Seventh
        The Bartender and the Russian contract to the Seventeenth
7yb:	Officio system universally adopted
        Kotarou Yuu contracts to the Seventh
        Odette Brighton and Harriet Blinde contract to the Seventeenth
6yb: 	Kotarou Yuu obtains the XIth Golden Weapon
	Tomoe Mami and *Kure Kirika contracts to the Ninth [2 months prior to Malal?]	
   	Kaneda Madoka (Malal) contracts to the Ninth [2/3 months prior to Malal Quest?]
	The Springfield sisters contracts to the Eighth
	Wendy Cooldown contracts to the Eighth
	Ekaterina Valnikov (Kharn) contracts to the Ninth
	Malal undergoes Warmaster training in the Ninth
        Lotte Laufson contracts to the Seventeenth
5yb:	Malal Quest 
        Doctor Emma Strauss is banished from the Thirteenth, Fran Madaraki takes up her position, now 'Chief Director'
        Varrigan City cut off from the outside world
        First Maerorus discovered
	Amber contracts to the Eighth
    	Sakura Kyoko contracts to the Ninth
    	Miki Sayaka contracts to the Ninth [5 months after Malal Quest]
	Karasawa Enishi contracts to the Ninth
        Therese Witton contracts to the Seventeenth	
4yb:	Eversor Kharn
	Rea Ashford contracts to the Ninth
3yb:	Kharn becomes Warmaster of the Ninth
        Brie Eldridge dies in battle, Odette Brighton becomes Warmaster of the Seventeenth, over half of the Seventeenth lost
2yb:	Mami Quest, Girl A (Murderface) is found
    	Kyuubey Quest, Chitose Yuma (Omegon) contracts to the Ninth
        Sayaka Quest
	Dahlia Marigold resigns as Warmaster of the Eighth and joins the Seventh, Mary Sue Springfield is the new Warmaster
        Miranda Farewell dies, Odette becomes increasingly unstable    
1.5yb:	Kharn Quest, the Third Officio is dissolved and absorbed into the Ninth [6 months after Girl A]
     	Ishikawa Kumatora contracts to the Ninth [6 months after Girl A]
        Forgotten Story
     	MAXIMUM CHRISTMAS
     	Walpurgisnacht in Mitakihara, Malal and all but one of the Ninth's Culexus die.
     	Kharn abdicates her position as Warmaster of the Ninth, becomes Murderface's partner
	Mami takes up the vacant position as Warmaster-in-training in the Ninth 
1yb: 	Kharn retires/exiled to the Ninth's R&D facilities in Siberia [6 months before MGNQ]
        Wendy dies in battle with Nicole, later brought back by Pinky
        Odette Brighton demoted, Therese Witton becomes Warmaster of the Seventeenth [??? months before MGNQ]
0yb:	MGNQ begins


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Notes:

*This is sort of a retcon since in the Retirement Arc, Kirika is written to be 17 years old and three years into service in the dossier.