This is canon to the series.

This is after Mika and Yuu's reunion.

Yuu asked the squad about taking Mika with them and Guren reluctantly agreed.

So,after Yuu met Mika again,he took him with the rest of the squad.

Skip___________________________________

The squad was in the forest,in their tents.Yuu wanted Mika to share a tent with him and Mika agreed reluctantly.

It's midnight,so everyone is asleep.

(You are Mika and a male.)