Tsuda and Endou have come to realize they can't stay the way they are forever. If asked about their relationship, they don't know how to answer. What do they need to stay together? It's not enough. They want more. They can't stop their feelings…
Endou-kun no Jikken Note is a completed manga by Hayakawa Nojiko, first published in 2013. It blends boys' love and slice of life. You can read all 7 available chapters of Endou-kun no Jikken Note online for free on MangaPulse; the newest is Chapter 7, added 2019-07-10. The series is finished, so you can read it from start to end in one go.