Mitsugu Bamba is a high school girl who is crazy about donating her blood, to the point that she feels compelled to visit a local blood bank despite the unfriendly nurse. One day, Mitsugu encounters a beautiful girl there who looks like she has come from overseas. The girl is so pale that she appears ready to faint. Instead, she suddenly starts trashing the blood bank. The girl then loses consciousness and so Mitsugu takes her home...
Mitsugu Bamba, who loves to donate blood, encounters vampire girl Maid Vlad Transylvania.
Mitsugu discovers that different types of blood affect Mai's personality. Mai ends up drunk and goes on a night-time romp.
Maki invites Mai for a garlic dinner and Kaoru invites Mai for a costume party, and she ends up causing trouble at both venues.
Everyone is now suspicious of Mai and want to know more about her. Mitsugu attempts to hide Mai, but a bottle of dragon blood turns Mai into a rampaging monster.
The fathers of Mai and Mitsugu, a vampire and a vampire hunter, pay a visit to see their daughters.
The Blood Donation Club puts on a stage play.
The Blood Donation Club makes a film.
The nurse hangs on to a special bottle of blood from her youth. Everyone wants to know the history of that bottle.
Mitsugu travels around a wonderland looking for blood and meets the Blood Donation Club in various new roles.
The Blood Donation club meets Mai's fiancée, the undead monster Franken Yasohachi.
The Blood Donation Club heads to a isolated island for a summer holiday. However, a fish monster is on the island and Nami goes missing.
Mai agrees to an interview about her history.
