Kedamono Damono

A romantic comedy Shoujo manga by Haruka Fukushima. The series focuses on Konatsu Narumiya, a high school freshman who manages her school's basketball team. When Konatsu goes to look for Haruki, a member of the basketball team, she finds out that he turns into a perverted girl at night. Haruki-as-a-girl then sexually harasses her, they wake up in the same bed, and Haruki admits that he knows Konatsu has a crush on the team captain. Long story short, the captain turns out to be a jerk, so Konatsu decides to go out with the ultimately well-meaning Haruki. Hijinks ensue.

The series was licensed by Tokyo Pop, but seems to be out of print.

This series provides examples of:

 * Ahoge: Haruki.
 * Attempted Rape: Konatsu has horrible luck with guys; every one of them save Haruki has tried this on her. Luckily Haruki is there to bail her out, usually as a girl.
 * Attractive Bent Gender: Haruki turns into a blond bombshell.
 * Belligerent Sexual Tension: Konatsu and Haruki constantly bicker over everything.
 * Bi the Way: Konatsu.
 * Catch Phrase: "I can't control my urges," and "You're a beast!"
 * Chained Heat:
 * Ecchi: As a result of girl Haruki's utter shamelessness.
 * Friendly Local Chinatown: Haruki and Konatsu go here
 * Gag Boobs: The general joke is that Haruki, ostensibly a boy, has bigger breasts than Konatsu.
 * Gayngst: Mostly averted. Konatsu mentions that she found herself more attracted to the female version of Haruki, though it doesn't seem to bother her too much.
 * Gender Bender: Obviously Haruki,
 * Get a Hold of Yourself Man: Ren to Haruki, after Konatsu starts dating Jun. He may not have convinced the male Haruki, but female Haruki rushes straight to where Konatsu and Jun are afterwards.
 * Girls Love: The If Its You Its Okay sort, and a lot of it for a shoujo manga.
 * Godiva Hair: Girl Haruki, who oftens ends up bare-chested for one reason or another.
 * Hot for Student: A couple of the teachers. Neither Konatsu nor Haruki return their affections.
 * Hot Springs Episode
 * I Just Want to Be Normal: Haruki. Occasionally he wonders whether he'd be better off as a girl.
 * Jerk With a Heart of Gold: Haruki. As a girl he's just a Lovable Sex Maniac.
 * The Ladette: Haruki is much more aggressive as a girl.
 * Lingerie Scene: Several, because for Konatsu, underwear is Serious Business.
 * Marshmallow Hell: When he transforms, Haruki inflicts this generally on the unsuspecting.
 * Ms. Fanservice: Girl Haruki, definitely.
 * Multiple Demographic Appeal
 * Opening Monologue: Since chapters are released irregularly, there's one at the beginning of every chapter from the POV of either Haruki or Konatsu.
 * Rape Is Love: Not quite as extreme, but this is basically how Konatsu falls in love with Haruki.
 * Romantic False Lead: Several of them, actually.
 * Schoolgirl Lesbians: Haruki is a discount version.
 * Sick Episode: In one chapter, Haruki changes genders whenever he sneezes.
 * Single Target Sexuality: Haruki.
 * They Do: Subverted. They try, but they never quite seem to get there.
 * Two Person Love Triangle: Konatsu is never quite sure which Haruki she's attracted to, or which Haruki is attracted to her. It's an ongoing part of her Character Development.
 * The Unfair Sex: Haruki probably wouldn't get away with any of the naughty things he does to Konatsu as a girl if he hadn't been one.
 * Unusually Uninteresting Sight: Almost no one questions Haruki's ability to change sexes; if they do, they freak out, run away, and are never seen again.
 * Widget Series: It's Ecchi Shoujo Gender Bender Girls Love... Who's the intended audience, again?