For Some Reason, My Little Sister’s Friend, Who Is Totally Devoted To Me And Has The Highest Liking For Me, Has Decided To Stay With Me While My Parents Are On A Business Trip And My Little Sister Is On An Excursion For Club Activities, So It’s Just The T

Native title: なぜか俺に一途で、好感度MAXの妹の友達が居候することになりました〜親は出張中、妹は部活の遠征に行ってて二人きりな件〜