' Would you like to try that 'kissing in order to confirm' thing with me? '

Shu and Hiroto are best friends who are famous at their high school. Shu should have been having fun every day since middle school, having fun and playing around with each other, but lately, Shu notices that Hiroto's adult-like behavor, which he only shows to him, is making his heart flutter.

Is this love? Or friendship? In order to confirm that feeling,they decide to try kissing each other once a day for a week. Unlike Shu, who can't help but feel embarrassed, Hiroto seems to be enjoying this situation somehow!?
「その『キスして確かめる』ってやつ俺とやってみる？」翔と広人は、男子高に通う学校でも有名な親友同士。
中等部からふざけあってじゃれあって、楽しい毎日を過ごしていたはずが、最近自分にだけ見せる広人の大人っぽい言動にドキドキしてしまうことに気づいた翔。
これって恋？ それとも友情？そんな気持ちを確かめるために、何故か１日１回お試しで広人とキスすることに。
恥ずかしさが止まらない翔とは違い、広人はなんだかこの状況を楽しんでいるようで!?
一途なクーデレ無気力男子×光属性な強気ピュア男子の思春期ムズキュンＤＫラブ！