JustifiedSuisen
It's an IckiKara/KaraIchi fanfic, if you don't like bl or incest then don't read!
Since you're still reading this description it means you are acually interested, good, then let me describe this story a little...
The events in this book takes place after 24 episode of anime Osomatsu-san when all brothers already reconnected and are living their normal lives. Only Ichimatsu's feeling anxious about his current life, but he have no idea why, until one of his brothers reach out to him and awakes even more doubts...
It's mostly a comedy, because all of our sextuples deserve love (especially Karamatsu...) with some more dramatic moments. All caracters are my interpretension of them, just so you know.
Now then, enjoy!