When Lin Ye woke up, he found that he had traveled through time and was bound to a [Many Children and Many Blessings System] - as long as he married the heroines of anime and had children, he would become stronger!

System: "Host, you have entered Sword Art Online. Please capture Asuna. Reward: Dual Blade Style - Modified!"

Lin Ye: "Wait, doesn't she have an official partner?"

System: "Open the pattern! Kirito? That's your future brother-in-law!"

then--

In "Date A Live", he successfully made Origami shout "Onii-chan" instead of "Go to hell, scumbag".

In Honkai Impact 3rd, Mei Raiden holds a knife to his neck and asks, "Say 'many children, many blessings' again?"

Lin Ye (calm): "Wife, listen to my explanation... This is really about saving the world!"

While other travelers were still struggling to fight monsters and level up, Lin Ye had already swept across the heavens with a group of cute kids.

"Dad! Uncle Gojo Satoru is teaching me the Unlimited Technique!"

"Mommy! Aunt Bulma said to build me a mecha!"

"Host, a new mission has been detected: Demon Slayer: Kocho Shinobu's favorability towards you increased by 50%..."

Lin Ye (holding his waist and sighing): "Tongzi, your mission...is it serious?"

Devastating news from Runeterra: the female heroes have collectively ascended to the planet of happiness. Blessed by the demon of happiness, Fahn now commands wind and lightning. Zaun encounters a monster-like power; Jinx, despite her best efforts, is powerless against it. A single injection turns her blood into a thick, oily jelly, her heart pounding and her eyes sparkling. Piltover, enraged, launches a righteous crackdown, but Caitlyn betrays them, indulging in a dose of happiness hormones. Dopamine activates her nerves, causing her to lose control on the spot. The hormones are too pure, too potent; she's left weak and hunched over, wolfing down a train-sized bento box in her small room. Noxus is astonished and secretly copies the formula, but a clumsy experiment by the beautiful heroine causes the happiness hormones to spread like a plague, ensnaring the entire nation. The Katarina sisters, however, enjoy their blissful lives. Curiously trying it out, Lux transforms into a Demacian water sprite, dragging Fiora to be her sister, enthusiastically recommending Sona, and then, under the bright sunshine, pulling her underwater—"You're next!" Freljord unified the frozen plains, the three sisters united to fight the demons. Their combined strength was unbreakable, but unfortunately, Faen's power was too great, and they temporarily retreated, suffering a crushing defeat and forced to sacrifice everything. Ionia used gentleness to overcome strength; Venerable Karma sacrificed herself to the tiger. Irelia, disbelieving her brother's actions, fought a fierce battle that overwhelmed the seven armies, leaving them weak and powerless, yet still proclaiming their invincibility… (Word limit applies). ————————The Zaun arc includes some political development elements; the ending of the Zaun arc transitions to a pure harem fantasy adventure.