The all-powerful middle schooler

Good news: He traveled to the second dimension and awakened an omnipotent ability.
The bad news: He's sick.
……
Rikka Takanashi: The most trusted ally of the Evil King's True Eye User, let us go together to witness the end of the world!
Busujima Saeko: Please let me become your disciple and learn the supreme sword art!
Kojima: Kukuku, my other half, come and awaken my power!
Ying Lili: Baka, don’t go crazy here!
Natsukawa Masuzu: The person you kissed for the first time was not Eriri, but me, Natsukawa Masuzu~
Toumori Sanae: Please, give me the strength, I can do anything Death!