うんぱい×松本いちか2作品連動企画・第1弾！！SIDEうんぱい、SIDEいちか、ドラマの行方で結末がかわる恋愛シュミレーションドラマ！没入感高めの全編主観で美少女2人との青春恋愛体験！！クラス替えで隣の席になったちょっと大人びた同級生・うんぱいさんと近所のお姉さんで女教師でもある女教師・いちか姉。この2人と繰り広げる恋愛学生生活。春夏秋冬様々なイベントを通じ、気持ちが揺れ動く青春三角関係を体感！後日発売の松本いちか視点、SIDEいちか（MIDA794）とセットで2つの中出しストーリーをお楽しみください！

Unpai x Matsumoto Ichika 2-Work Collaboration Project – Part 1!! SIDE Unpai, SIDE Ichika, a romance simulation drama where the ending changes depending on the course of the drama! Experience youthful romance with two beautiful girls from a first-person perspective throughout the entire story with high immersion!! Unpai, a slightly mature classmate who sits next to you after the class change, and Ichika, the older sister from the neighborhood who is also a teacher. Experience a romantic student life with these two. Through various events in spring, summer, autumn, and winter, experience a youthful love triangle where feelings fluctuate! Enjoy two stories of internal ejaculation together with SIDE Ichika (MIDA794), Matsumoto Ichika's perspective, which will be released at a later date!