Spoiler
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So Kasaki's always in love with Hina since the 1st time they met (Takemitchi called himself hero, which drives Kasaki last words to Takemitchy when he shoots Takemitchy). But Hina always loves Takemitchy and she rejects Kasaki's proposal in the future. So as long as Kasaki cant have Hina, no one else can. He kills her multiple times bc of that thought.
Hope this helps
SPOILER
Ok so the reason why kisaki always kill hina in the future bcus , kisaki was inlove to hina ever since they were elementary/middle schooler (HERES THE REASON WHY KISAKI KILL HINA),,,, theres this part where kisaki proposed to hina in the future and hina rejected him bcus hina really loves takemichi ,,, so kisaki got really angry and yea he killed hina
(like every future) bcus hina rejected him , and the reason why kisaki was really angry on takemichi bcus to kisaki he thinks takemichi stole hina from him and not just about hina but every plan of kisaki was ruin by takemichi ,,, so yea thats the reason why kisaki sexy brain is really angry on takemichi and killed hina in thw future , (SORRY MY GRAMMARS ARE WRONG)
kisaki was inlove to hina when they were kids (like the part where hina compliment kisaki bcus hes smart)
Bro he just down bad that's all there is to it
Prolly spoiler or whatevs uhm so im at ch 92 rn so...i have a question yk hina and kisaki both knew each other when they were in elementary. they also met takemitchy one time when hina was stopping a middle schooler(?) and takemitchy showed up shouting "the hero has arrived" am i right?and also before going back to the past again kisaki was abt to shoot takemitchy with his gun right? and he also said "my hero"....and everytime he goes back to the future hina always end up getting killed by kisaki ryt? so does kisaki sees takemitchy as his hero or sumn? why does kisake wants hina to be dead ?is he killing hina cuz he's obsessed with takemitchy? or is he prolly inluv with hina and he's like "if i cant get hina then takemitchy cant get her too" sorry if u cant understand what im saying,im not fluent with english