(Crossover) On the Compatibility of Fire and Superpowers

The bowl-and-pot-splitting, nine-bag-noodle kid who was brought to the future was horrified...

Damn it!!

My little sister, who’ll only just have turned sixteen ten years from now, is getting MARRIED?!

Her severely sister-obsessed brother is heartbroken (︶︿︶)

After defeating Byakuran and returning to ten years earlier, the Tenth, holding his soft and adorable little sister, makes a solemn decision. Thus begins a fierce battle to protect his sister...

Nine years later...

In front of the tightly locked Sawada family gate, he faces his brother-in-law, whose flames of wrath are burning, along with a host of natural disasters and a certain little princess upstairs, laughing herself silly on her bed...

The esper: ...Teleport.