Tenchi Muyou! in LOVE 2: Haruka Naru Omoi

Tenchi enters the mountains and vanishes. Ayeka and Ryoko search for him across Japan and eventually find him in Tokyo, where he has aged several years. He now resides in what seems to be a parallel world with a girl named Haruna and no longer recognizes Ayeka and Ryoko. A link exists between Haruna and Tenchi's grandfather, Yosho. Ayeka and Ryoko must uncover Haruna's intentions toward Tenchi and save him before he is lost permanently.