I'm guessing, based on the number of handsome-but-suspicious teachers, that we're going to have a running theme of<em>inappropriate</em>teacher-student relationships, probably culminating in one or more teachers being wrapped up in the supernatural side of things...  sweet!  I suppose on that note, however, that we probably need a sexy 'just old enough' man-eating female teacher.  Or perhaps the school nurse?<br/><br/>More thoughts on possible class periods: study hall (libraries, woo!), biology (same reasons as chemistry, plus sex ed?), some sort of 'cultural' class (geography/world history, etc.)...  uh, I can't think of anything to make math interesting, but maybe someone else can.<br/><br/>Here's a question: are any of the characters involved with sports teams or after-school activities?  Those sort of things--book clubs, computer clubs, etc.--are pretty<em>serious business</em>in a lot of Japanese high schools, with practically all students expected to participate.  I could see Hikari being on a gymnastics or track team, and some sport she's not very good at (soccer, basketball, etc.).  I'd also imagine she'd get roped into cheerleading against her will just because she doesn't have the backbone to say no.