Use a Skull Crusher on the Readers!

[Alternate history + Japanese school-life light novel + breaking the fourth wall and crossing dimensions + absurdist humor + wildly imaginative nonsense... This, dear reader, is the book before you.]

[The front blurb:]

The male lead's peaceful, still-as-a-pond school life begins to fall apart on the day he's forced to confess to a girl beneath a ginkgo tree.

From then on, the chuunibyou male lead feels like he's surrounded by more and more people with delusions of grandeur:

Is his airheaded little sister an extreme brocon vampire princess, and is his good buddy, a total background character, actually an alien pretending to be human?

Is Zhuque Liang, his romance strategist, an ancient man mysteriously reborn and transmigrated into the modern era, and is the Penglai shrine maiden, Kagura Yi, a cybernetic being from the future?

Is the author friend he met online actually an evil god, and is the academy's saintess really the reincarnation of a deity?

... (N other cases of chuunibyou omitted) ...

As a “chuunibyou” patient who sometimes hears and sees things and is a little prone to delusions, the male lead has this to say:

Chuunibyou is an illness. You should seek treatment as soon as possible.

And so begins a mind-bending, head-splitting fantasy of school life!

[The back blurb:]

Blind and foolish Azathoth lies trapped in an endless cosmic dream.

Mirexado endlessly proliferates all things in the world, the Sphinx seeks to glimpse the mysteries of the cosmos, and Nyarlathotep hunts for pleasure in the human world.

The mortal world, a single grain in the vast ocean, is just a tiny corner of Their expansive stage.

Insignificant humans are merely bickering bugs or untidy roadside shrubs.

We are all extras and bit players in the universe's grand, absurd drama.

And the boy named Lan Ya is one of the countless incarnations of that blind and foolish god within the cosmic dream...