1. "Theme of SSS" from Angel Beats
a. Sections 11-12. The notation from the bass clef rises up to the upper portion. Same thing in section 15. How do I read these notes?
b. Sections 23-24. What are those oblique lines saying?
c. Sections 32-33. Two different sets of notation. How am I supposed to read this? Also once again the left hand notes are rising up to the treble clef staff. The same thing is also happening in sections 28 and 43.
a) It seems the software used doesn't like upper leger lines on the bas clef much. It means the notes are to be played as part of the bass line, but read them according to their place on the treble clef. You may find it easier to use your RH to play them, as well, but remember they are part of the bass line.
b) The melody here is in the middle and moves between the staves - the lines show how it moves (Gb F Gb Gb F Gb Ab F Eb)
c) On the double notation, it's a sloppy way of saying that those chords are held (using the pedal) for a whole crotchet beat, but the lower chords are normal quavers). As to the other bars, play the upper notes (whatever staff they are on) with the RH, the lower ones with the LH.
c)
2. "Monochrome Kiss" by SID from Kuroshitsuji season1. Do I play the first treble clef row with the first bass clef row? What happens to the other pair?
This is written for two pianos (and two pianists

) to play together. Find another edition.
3. "Sannin no Dragon Slayer" easy version from Fairy Tail
a. The coda sign on top of section 17, pg. 1 where does it apply? Does it connect to the D.S. al fine at section 32 pg. 2
b. pg. 4 section 114-115. There is a D.S. al coda sign along with Fine written. How does this work?
I have absolutely no idea. It doesn't follow any convention I'm aware of. Do you have audio you could listen to (following the score) to see what is meant?