Tokyo: Taking in an Runaway Heiress

This is Tokyo, Japan, in a parallel world. Orphaned by the death of their parents, impoverished college student Kiryu Hikaru and his younger sister depend on each other. But his sister has contracted a "strange illness." On a snowy night, Kiryu Hikaru meets a young lady who has "escaped" from a massive organization. She flings a check for ten million yen in his face, asking only to live in his home and share his life. But with money tight, Hikaru refuses... As the "wheels of fate" turn, more and more "troubled girls" appear in his life, and a series of strange events follow one after another... "Hikaru, when I’m in trouble again, you have to come save me." "No! Just one more time! Senpai is mine!" "Kiryu, you’ve worked hard enough... You can rest here with me for a little while." "You know, I’m working hard to become the most important person in your heart." "Big brother! Don’t forget to eat your lunch today." "Hey, if you cheat on me, I’ll kill you and that woman, then kill myself." "Ugh, that’s terrifying. Wouldn’t that make you a murderer?" "Then you should work hard so I don’t become one." [A story of saving one another, as people tend to each other’s wounds. And so the story begins.] "Kiryu, you really are one hell of a youth."