Tomodachi No Nechan to Futokoro Asobi 1 (Bamboo Comics)

[Machine Translation] In the summer of 1999, I was in the 5th grade of elementary school, and my sister, a delinquent female office worker, was playing a nostalgic game with me. On the day that the Heisei Era ended and the 2021 era began, Kasuga, an ordinary office worker, recalled his memories of 1999 when he was in elementary school. He remembered his friends and family, and... Mayu, a lazy, tired office worker and his friend's older sister. Kasuga had been playing alone with Mayu for a long time. They play in the river without telling their friends, and sometimes...they do things they can't tell anyone. Mysterious but slutty older sister makes me nervous... Hide-and-seek, Daruma-san koronada, crossing the white line... Nostalgic games, and if you get shy, you will be punished! A secret coming-of-age romantic comedy with my best friend's sister!

1999年の夏、 小学5年生の俺が 不良OLお姉さんに 懐かし遊戯で ひたすら遊ばれていた??。 平成が終わり、令和になったその日、普通のサラリーマン・春日は小学生だった1999年の記憶を思い出していた。友達や家族の交流、そして…ぐーたらでくたびれたOLで友達の姉・真由。 春日は真由と二人きりでずっと遊でいた。友達には内緒で川遊びをしたり、時には…誰にも言えないことをしていたり。ミステリアスだけど、だらしないお姉さんにドキドキさせられ…。 かくれんぼ、だるまさんがころんだ、白線渡り… 昔懐かしい遊びで、照れたら罰ゲーム！！ 親友の姉と内緒の青春ラブコメ！！