#2&3 Spin-off/sequel
It has the second volume as well as it looks like working on the 3rd volume
The Kamisawa family's case is unique. because on paper, having the ability to see the red string of date and other kind of strings seems advantageous. But the ability is a double-edged sword. Kaoru could see OTHER people's thread of destiny but can never had his own in return. That is why he always kept it casual.
Chapter three is rather painful. Kaoru's fears about this whole was voiced out the same time he realized his feelings. "Checking if their string is still not connected everytime they meet other people each and every day is terrifying!". He said. Hopefully Kaoru won't get hurt in the end and get his happy ending.
Kanawanu Koi no Musubikata