Wait until it gets warm. on BLUE comics

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Junpei calls his senior "Ichan" who says that the bathroom is broken into his room. After two nights, Junpei gets drunk and gets into a physical relationship after a desperate kiss.
The next day, Junpei is ready for an "insertion," but as soon as he suddenly mentions an ex-employee of his workplace, Tsujii, Ichan's face changes.
In the end, Junpei fails, and the day comes when Ichan returns home.