Kip. 1: A Girl I Met in Another World

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Hinata Sunohara, a Japanese high schooler, was summoned to a magical world to help vanquish a powerful Demon Lord. After the Lord is slain, Hinata is transported back to Earth, much to the dismay of his teammate, the dark elf Mariabelle (Bell), who has fallen obsessively in love with him. One month later, Hinata is startled to discover that Bell has used her magic to follow him back to his apartment through a portal, completely naked. Though flabbergasted by her blatant advances, he gives her clothes and food and then helps her bathe. She tries to seduce him, but he slips and hits his head. She rests his head on her lap and swears she will never leave him.