Shizuku's (PC-98 version) 100% CG guide
Translated from: http://ifs.nog.cc/destiny-tiar.hp.infoseek.co.jp/kouryaku_sizuku.htm

Ending #1: Graduation ceremony
-Your choice
-"I'm fed up with this already"

Ending #2: Saori's bad ending
-Your choice
-I feel inexplicably attracted to the word "insanity"
-"Sure, I'll do it"
-I'll head back to class
-Your choice
-Let her join the investigation
-Your choice
-"It's hard to talk about that..."
-"H-Half past eight"
-"Right here"
-"Supper"
-Enter the gym to look for Shinjo
-Look for Shinjo everywhere
-I'll apologize
-Ask her if she's scared
-Your choice
-Open the door by force and find out what's inside

Ending #3: Saori's happy ending
-Your choice
-I feel inexplicably attracted to the word "insanity"
-"Sure, I'll do it"
-I'll stay at the rooftop thinking for a while more
-"So, basically, you're collecting psychoelectric waves here on the rooftop?"
-Your choice
-Let her join the investigation
-Your choice
-Explain her everything as it is
-"H-Half past eight"
-"Right here"
-"Supper"
-Wait for her a bit more
-"Don't worry, I'm here to protect you"
-Listen in for sounds
-Circle around the back and spy through the window

Ending #4: Mizuho's bad ending
-Your choice
-I feel inexplicably attracted to the word "insanity"
-"Sure, I'll do it"
-I'll stay at the rooftop thinking for a while more
-I don't know anything about these antennas or psychoelectric waves you're talking about
-Your choice
-Flat-out reject her
-Your choice
-Your choice
-Let her join the investigation
-I'll wait a little longer
-Go check out the student council room
-I should keep it a secret
-Grab her hand
-I-I think they're average
-Say "I'll help you search for Ohta"
-Beat the crap out of Tsukishima

Ending #5: Mizuho's happy ending
-Your choice
-I feel inexplicably attracted to the word "insanity"
-"Sure, I'll do it"
-I'll stay at the rooftop thinking for a while more
-"So, basically, you're collecting psychoelectric waves here on the rooftop?"
-Your choice
-Flat-out reject her
-Your choice
-Let her join the investigation
-I'll start the investigation alone
-Go check out the student council room
-Tell her everything as it is
-Your choice
-Your choice
-Say "Show me the music box"
-Save Mizuho

Ending #6: Losing against Tsukishima
-Your choice
-I feel inexplicably attracted to the word "insanity"
-"Sure, I'll do it"
-I'll stay at the rooftop thinking for a while more
-"So, basically, you're collecting psychoelectric waves here on the rooftop?"
-"Tell me about those suspicious shadows"
-Flat-out reject her
-That the shadows were sighted near the gym
-If she noticed something strange in Ohta before the incident
-I'm sorry, but I'll have to turn her down
-Yeah, you guided me here

Ending #7: Toaster ending
-Your choice
-I feel inexplicably attracted to the word "insanity"
-"Sure, I'll do it"
-I'll stay at the rooftop thinking for a while more
-"So, basically, you're collecting psychoelectric waves here on the rooftop?"
-"Tell me about those suspicious shadows"
-Flat-out reject her
-That the shadows were sighted near the gym
-If she noticed something strange in Ohta before the incident
-I'm sorry, but I'll have to turn her down
-No, I didn't receive anything
-I'm worried about Mizuho, but for now I'll watch from afar
-I'll jump in now and save both of them!
-I'll submit to my lust and rape her

Ending #8: Ruriko's true ending
-Your choice
-I feel inexplicably attracted to the word "insanity"
-"Sure, I'll do it"
-I'll stay at the rooftop thinking for a while more
-"So, basically, you're collecting psychoelectric waves here on the rooftop?"
-"Tell me about those suspicious shadows"
-Flat-out reject her
-That the shadows were sighted near the gym
-If she noticed something strange in Ohta before the incident
-I'm sorry, but I'll have to turn her down
-No, I didn't receive anything
-I'm worried about Mizuho, but for now I'll watch from afar
-I'll jump in now and save both of them!
-I'll fight against my own desire

Ending #9: Ruriko's happy ending (must have seen Ending #8 first)
-Your choice
-I feel inexplicably attracted to the word "insanity"
-"Sure, I'll do it"
-I'll stay at the rooftop thinking for a while more
-"So, basically, you're collecting psychoelectric waves here on the rooftop?"
-"Tell me about those suspicious shadows"
-Flat-out reject her
-That the shadows were sighted near the gym
-If she noticed something strange in Ohta before the incident
-I'm sorry, but I'll have to turn her down
-No, I didn't receive anything
-I'm worried about Mizuho, but for now I'll watch from afar
-I'll jump in now and save both of them!
-I'll fight against my own desire
-"He's a victim, too..."

Ending #10: Call your uncle / Crushed mind
-Your choice
-I feel inexplicably attracted to the word "insanity"
-"Sure, I'll do it"
-I'll stay at the rooftop thinking for a while more
-"So, basically, you're collecting psychoelectric waves here on the rooftop?"
-Your choice
-Flat-out reject her
-That the shadows were sighted near the gym
-Your choice
-I'm sorry, but I'll have to turn her down
-No, I didn't receive anything
-I'm worried about Mizuho, but for now I'll watch from afar
-I'll save them after contacting my uncle

Ending #11: Kanako's ending
-I think about her

Ending #12: Losing against the dimensionalings
[Pick the wrong choice during the battle below]

Ending #13: Victory against the dimensionalings
-I simulate a fight against the dimensionalings
-Yes
-Tornado Tech: Large League Ball II
-Ruriruri! I'm counting on you!
-Throw the bill at it
-The mix of several alcoholic drinks
-Mizzy!
-Let's go with a finishing blow!
-A sudden ultimate attack!
-Love!