Even Chuunibyou Wants to Save the World

You are in the late stages of chuunibyou when you transmigrate. After cautiously observing the world for a week, you decide it's absolutely awful. Then you save a little boy who got caught in the crossfire of your protagonist aura, and it hits you: you must be the savior summoned from another world to rescue the natives.

27: "Stop defining yourself like that!! How did you go from saving someone to deciding you're the savior? Does that even make sense?!"

Ignoring the random passerby's complaints, you begin your series of heroic deeds.

27: "Don't beat up your classmates!!"

59: "Are you a spy sent by the enemy family to ruin our reputation?!"

80: "Haha, our new classmate is as lively as ever."

The pitiful passerby will never understand the great mission you bear. Standing above the crowd, you sigh: Today was another day of working hard to save the world.

No one believes you're the savior, until the world-ending villain really does appear. You stand before everyone and, through a sacrifice bordering on martyrdom, manage to win back a sliver of hope.

You died, then came back to life, but can someone explain why everyone seems so different after waking up?!

Reader's Notes:

* The female lead has chuunibyou.

* Love-interest selection story.

* She transmigrates into a parallel world that Byakuran destroyed ahead of time.

Theme: Live well and cherish the present