(I noticed that this mangaka is very much into powerful mysterious lifeforms?) Anway, this is a somehow bizaare combination of slice of life, psychological depth & sci fi. An alien creature who, out of her whim gave these two who were already dead a second chance. Will they be able to change their fate? Cute happy end. ➴ Read past here if you fail to understand the story
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So alien due to her whim pulled an omnipotent-level of change for this two individual's life... who were suppose to be already dead btw and gave them a quest to fulfill so she could just turn back time and give them back their lives. So she pulled them out of the regular earth's time and placed them into a time-space loop where they could fulfill their mission. Along the way, he started wanting to know more about seme and he went the roundabout way by checking on the old version of seme despite being hurt over and over. Uke's deepening feelings for seme posed as a persisting problem to the point that he wanted to call quits but seme wants to continue bec he's also started to feel attraction. Seme, however looks at all these in a different perspective and tried to clear thing over. Aaand, chapter 8 is our closure that the author wanted to give. The alien life form lost interest in these two because they acted different than what she expected (too bad she's not a fujoshi like us) so bec. she got bored, she left them to look for other people to beta test (the alien technology) with and now the couple is stuck in this time-cycling limbo where they are free to do whatever they wanted to do and had all the time to be honest with themselves (especially the uke). And so the seme finally declared his intention and they lived lovey-dovey happily ever after. At least they got their second chance in life. Not in the way they and us reader expected, like the stereotypical return to original timeline and change the situation but a unique happy ending with a little bittersweetness on it.
Tengoku e Ikebaii