After watching an episode of Jitsu wa Watashi wa, I rushed to Batoto and loaded up on spoilers. Hoo, boy. The important fact we ought to know is that the manga is resolved, so the anime ought to be safe.

The character designs differ from the anime and the lead girl strongly reminds me of someone, but I cannot remember who. The mangaka doesn't have anything else credited to him.

One other random observation is that apparently Japanese use a native word for a "vampire": 吸血鬼 (kyuu-ketsu-ki). Russians use the borrowed "vampir". Althoguh they had a native word for it ("upyr'"), it fell into disuse.