After Undead learnt about the curse of Izumo Fuuko and knowing that it would be useful in killing him, he brought her to his abandoned hospital hideout. There, he tested various aspects of the curse. However, he was interrupted when the organization infiltrated their base and ambushed him. The conflict ended when Fuuko kissed him and caused a lightning strike to zap both Undead and the assailant, defeating the foe.

Correction

Um actually … The kiss didn’t cause a lightning strike. The lightning is caused by him cutting her hair.

The kiss caused a meteorite to obliterate the hideout.