Oh Love Me Mistress: A Kaguya Crossover Fic

And here comes the promised note of a shitty author.

*SPOILER AHEAD* but I'm sure none of you give to that crap for such shitty fan-fic of mine.

We start with the basic parameter of our MC

Name: Yuu Shinomiya

Race: Homunculus

Attributes: Black hair, Red eyes, Low ponytail hairstyle.

His hair should be snow-white like any homunculus but black instead because the flawed procedures due to his original maker stole the incomplete research of Einzbern Clan. The villain we saw in the earlier chapter was a rogue member of the Einzbern clan. Maybe at some point, I will make a backstory about him…and a name.

Trait: Calm, collected, playful in nature, and curious.

Parameter and skill will be exempted for this time.

Power/Noble Phantasm:

1. Moon Cell Automaton - EX

An ancient alien supercomputer that once exists inside the moon, its objective is still unknown despite recording the entire timeline of humanity and the world. It was now possessed by Yuu Shinomiya, all because a certain admin or moon sovereign transmigrated or sliding to Yuu body.

Weak and battered he decided to fuse his soul with the original Yuu along with a foreign soul. Tough the sovereign decided to erase the foreign soul except some of its memories.

As you've noticed the sovereign we're talking about was a certain Hakuno Kishinami but with Alter and dead face form, though this one is from an AU timeline where his route was "Perfect" hence his admin status after defeating Star of destruction SEFAR and Archimedes.

Made of pure photonic crystal, its mana input can surpass and overshadow that of counter-guardian rivaling heaven feel's magic and capable a limited version of 2nd magic. Though Yuu won't be able to use this to its full potential due to his mana output and limitation of a mortal body, imagine an ocean of water to be only transferred through a couple of straw.

He could use code_cast that will be processed by moon cell giving him an almost instant way to project magecraft. With the help of Moon cell, he could develop a reality marble isolated inside the SE.RA.PH and isolated it in the far side of the moon.

2. Pure mystic eyes of Origin Reversal -EX

Eyes that exist outside the boundary of time and law of the world, and it have the sole objective to record the worlds before and after its creation in hand of 'god'. Manifested by the Moon-cell for observation the world outside and meddling of a certain mother figure of Yuu.

It's one of the only stable Mystic eyes due to its passive nature. Its only power is "Origin Reversal" a state where the object is laid on will be regressed to its original form until it ceases to exist. Hence a man regressed into a teen, toddler, baby, then to base form until it has gone into molecules.

But it also capable of the extraordinary feat of structural analysis, like a certain faker.

If unleashed to its full extent -Due to its foreign aspect, no mortal on earth is capable to resist and rationalize its nature. Similar to a TYPE entity all of that gaze upon it –its brain will be explodes into gory sight, along all the nerves, and magical circuit due to comprehending something beyond human capability.

With proper usage, it could be used for de-aging something, for example, a rusted metal could be returned to its new state. But like all power, it comes with a cost, namely enormous prana it required to manifest and maintain. Without training, Yuu could manifest these eyes as long as 4 seconds before his body broke down.

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INDEX

1. Shinomiya Clan.

An ancient lineage of magi in Japan originated from a bladesmith family of Edo period. Since the opening of foreign trade, it came in touch with Europe magi organization clock tower expanding its network all across the continent. One of the only unconventional magi clan that dabbles in mundane matters and becoming merchant for the Nanban, selling japan magical ingredients and mystic code to magus in the clock tower.

It reached a height in power after the fall of Tokugawa shogunate by allying itself with the foreigner and investing in foreign goods, unofficially making it one of the ruling powers in its time.

Regressed after the great disaster in magi society, almost all of the knowledge Shinomiya clan acc.u.mulated is gone or stolen in chaos. All it left was some of the research book and a magic crest.

2. Shinomiya Group.

One of the most powerful and influential Zaibatsu in japan, it was also one of the shadows pulling the string behind the modern japan. Its voice could bend the law and deny the collective voice of japan diet.

Originated from a bladesmith family, it cleverly placed itself in international trade since the Edo period bringing goods from the west, and become influential enough after Tokugawa shogunate.

It was also famous for producing one of the most modern aircraft carriers during its time, Shoukaku and Zuikaku, also the responsible party in proposing and developing the largest battleship known to humanity, Yamato-class.

Secretly become the force behind the defeat of imperial Japan, also the reason why the American never made japan its satellite or puppet nation after the world war.

Nowadays it dabbles in production of military armament, electronic technology and warfare, and civilian goods. It also has a multinational military research agreement with Germany, France, Belgium, and some nation of NATO.

Also, it's a responsible party in the current arming race that occurs between south-eastern Asia nations, due to the rising threat of the Republic of China and the East China Sea dispute.

3. Codename HER.

The parental and mysterious figure that was responsible for raising Yuu during his experimentation inside the dungeon. It was believed she was not dead, and actually, an alien entity that tasked to nurture the future moon sovereign but alas like any mother she grows fond of Yuu innocent behavior. See the priestess of alien god in FGO for reference.

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Current Cross-over

1. Kaguya-sama: love is war.

2. Fate/stay night

3. Fate/Extra, Extella

4. Grisaia no Kajitsu

Planned Cross-over, doesn't mean it will be implemented inside the story.

1. Monmusu.

2. Sankarea.

3. Fate/grand order.

4. Eventual Mahouka koukou no Rettousei.

5. Sci-fi? Maybe mass effect or halo, I'm not sure about this one.

6. Brief Isekai, maybe log horizon or generic Isekai but I didn't read the novel. He will be transported then go back.

7. Touhou project, not sure but its source is pretty complex maybe only some of the character like Marisa or Alice.

8. Hayate the combat butler.

9. Azur lane.

10. Majikoi, I will implement this in the future chapter.

11. The list still goes on with some notable anime romcom and comedy, and you may suggest something.

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Harem? I'm not sure, but looking at the long list of cross-over, it will be certain but small.

And for the small record, I will not include Kaguya as part of his love interest. This fan-fic originated and inspired from pitiful look of Hayasaka in her bath screen time and confession arc in the manga. Though I'm not sure about Fujiwara Chika, I can't see her in any love situation please help.

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