Mami wakes up in a deserted and metal themed shrine house with lots of coffins around it for some reason.
" W-Where am I? not important I need to find Koro!" Mami said trying to transform via her soul gem but it's not working, Mami proceeded to run through the shrine avoiding various shadows as suddenly a shadow's claws scraped her dress. " Ahhh!!!" Mami screams after getting right back up she keeps running sweating a lot, she sees a shrine door with a sign that says " Funeral room"
" This must be it.. I'm coming Koromaru!"
Mami says as she opens the door, when Mami enters she sees the two muscular Shiba Inu beastmen with long spiky hair and ear piercings, staring at each other. The real Koromaru is wearing a black suit with a orange tie while Shadow Koromaru is wearing a white and orange funeral themed shaman outfit with a skeleton pattern on it and of course the signature yellow shadow eyes.
" Still not over your ex's death the shrine maiden whore who made you accept a foolish oath?" Shadow Koromaru taunts the real Koromaru, Koromaru's teeth gets sharp as he yells at Shadow Koromaru.
" Shut the hell up! get out of my face! I'll kill you!" Koromaru angrily flips his shadow self off, the usually calm Beastman has completely melted in a burst of anger.
" Koro-Sama! please… I think he's trying to manipulate you…" Mami sighed never desiring to see her future husband so angry.
" Mami please get away from here, even if I can't summon my Persona I'll deal with him thoroughly.." Koromaru looked at Mami smiling a little bit; sadistically Shadow Koromaru looks at Mami.
" Oh? Is this the new whore your with? she's mighty pretty, that blonde hair of hers works wonders~ how long until this whore asks you to wait for eternity?!" Shadow Koromaru says,
" Shut up!!! You fucking doppelgänger! you will never be me! YOU ARE NOT ME!!!" Koromaru yells as he drops to the ground and falls unconscious.
A dark mist surrounds Shadow Koromaru as he transforms
" This is it! Bare my wrath!" He says as Mami transforms into her magical girl form, her magical girl form looking more mature and with a longer dress and heels,
Mami creates multiple ribbons and binds them around Shadow Koromaru, Shadow Koromaru's boss form being a skeletal being with dog ears a beating red heart on it's chest and detached Angel wings with tears on them & knives as well.
" Let me go! Insolent woman!" The shadow screams trying to break free of Tomoe's ribbons, the knives on his wings are sent towards Mami, luckily Mami dodges.
" Well since you insulted my husband I guess I can't help but hold a grudge haha.." Mami says smiling as she fires a barrage of musket shots at the shadow's heart as the heart is on the verge of collapse, Shadow Koromaru breaks out of the ribbons throwing even more knife projectiles at Mami, Mami does a ballet flip into the air and jumps back onto the floor dodging the knives.
" As a senior magical girl I have faced way worse then you, now submit you foul imitation of my beloved!" Mami says as her musket grows into a size comparable to a canon as it fires a orangish red blast " Tiro finale!" The blast surveys area destroying Shadow Koromaru's heart and body turning him into black mist. Koromaru gets up grunting to himself.
" Koro-Kun! Are you okay?" Mami asks concerned for her husband's well being
" I'm fine.. thanks honeycakes.." Koromaru smiled kissing Mami on the cheek.
Shadow Koromaru got up as well and looks sincerely at the real Koromaru.
" Are you sure you can trust Mami? What if she leads you astray like that shrine maiden woman from years ago?" Shadow Koromaru asks unsure of his future.
" I promise she won't… she is my beautiful wife and i know for a fact Tomoe would never lead me on.. your worries have no merit!" Koromaru replies eagerly a smile on his face as Shadow Koromaru faded away, Shadow Koromaru then turns into a steel metallic like being with a Shiba Inu head red eyes long spiky hair a skeleton themed body and a bladed tail as it disappears it goes into Koromaru.
" Hades……" Koromaru says the name of his new Persons under his breath as he falls to the floor.
" Koro! are you okay?!!" Mami says worriedly
" Yeah I'm okay…. let's go home my love, and make sure to stock up on grief seeds if you need them, wouldn't want you witching out before we have our wedding~" Koromaru teasingly says as Mami sighs.
" Clever one…" Mami says as she carried the extremely muscular and rugged Shiba Inu beastman back home tucking him in and kissing him goodnight.