Encirclement Love summary:

Ryou had a sleepover and saw his friends - Issei and Tadahiro - kissing while they thought he was asleep. He asks them about it and feels betrayed as a childhood friend when they pretend nothing happened.Determined to catch them red-handed, Ryou ends up inside a closet with Issei's little brother - Yuusei -, who has a unexpected reaction to the situation.