Wakana and Yasu, twin girls, and a Samurai and Ninja

Most of the girls in the Time Traveler's Club try to get along with each other, but there are two girls who absolutely cannot stand each other. Twin girls from a past Japan who make every opportunity to learn about the present time and make friends with everyone else - except each other. They're both alike in their looks: dark hair, green eyes, B-cup breasts, and strong athletic builds that even Denise admires.

The first girl, Wakana, claims to be a samurai. She's very soft spoken and prefers to study with the other girls. Any time you see her, she is doing something to "better her education of this world." Supposedly, her armor is stored with the other girls' equipment somewhere in the school. She is constantly yelling at her sister Yasu for her "dishonorable" life, usually referring to her occupation.

Yasu claims to be a ninja. Despite supposedly being an "assassin," she's very loud and boisterous. She loves attending parties with the other girls and is more interested in all the excitement and entertainment the modern world has to offer. Her insults to her sister are more of a teasing nature, as she seems to want her "uptight" sister to stop being so dramatic and enjoy herself before life slips her by. No one has seen her without her sword since, according to Sophia, she claims she feels "naked" without it.

Now, one of you is going to get a true understanding of the word "naked." And not in the way you prefer.