Honkai Impact 3rd: Waiting for the Flowers to Bloom

Female protagonist, slow burn, exceptionally powerful.

Everyday life from the Previous Era to the Current Era.

There are many author-created details, so please don't complain if that's not your thing.

"If time could turn back, I would still choose to meet you, even if our ending had already been decided."

…

"Qilian... do you know?"

"You said you'd show me every beautiful thing in the world... but without you, even flowers blooming feels lonely."

"You taught me how to smile, how to fight, how to learn to love someone... but..."

"You forgot to teach me how to forget you."

"…"

"But... I don't regret it..."

She sat on a chair in the garden, quietly watching the flowers. At last, her gaze settled on a pink tulip.

"Qilian, the flowers have bloomed... when are you coming back to see me?"

"..You said you'd come back when the flowers bloomed..."

"But my flowers... have bloomed tens of thousands of times already..."

"You broke your promise again..."

"Qilian... you big liar..."

"…"

"Drip."

Ah, it's raining...

"Qilian, look... the flowers have bloomed again this year."

…

"I waited until the end of the world, but I never got to hear you say, 'I'm home.'"

"Let me introduce myself. I'm □□, a girl as radiant as a drifting blossom, as you can see♪"

…

"Hmm... then let me introduce myself again. My name is □□□□. I'm a Herrscher, a... Herrscher of □♪"