I Can Transmigrate Freely, Yet I'm Obsessed with Saving Corrupted Heroines

Suddenly, he gains the power to transmigrate freely between worlds. He could use it to become invincible, but a heroine who keeps throwing herself at him holds him back. Faced with her passionate advances, he simply can't turn her down.

Shinji tries to use magic to make Rin Tohsaka submit, but then the protagonist shows up.

Fujimaru Ritsuka, who has some strange hobbies, uses the Holy Grail to create a bizarre Singularity. He snatches the Grail outright to create his own Singularity.

Gensokyo faces an invasion by a strange human. When dealing with this odd intruder, the obvious choice is to take his place.

“...”

Why do the monster girls seem kind of cute, too?