The All-Powerful Chuunibyou Prodigy

Good News: He transmigrated into an anime world and awakened an omnipotent ability.

Bad News: He's ill.

...

Takanashi Rikka: "Oh most trusted ally of the Evil King's True Eye! Let us witness the world's ultimate truth together!"

Murasakibara Saeko: "Please accept me as your disciple and teach me supreme swordsmanship!"

Kobato: "Kukuku, my other half! Come awaken my sealed power!"

Eri: "Idiot! Stop acting crazy here!"

Shinjou Masuzu: "Your first kiss partner isn't Eri - it's me, Shinjou Masuzu!"

Dekomori Sanae: "I beg you! Grant me power! I'll do anything, death!"