Usaida Shiro No Egao No Himitsu (Kosu Mikku Bunko Arufua Hi 3-5 Daikazoku Yon Nan 5)

[Machine Translation] Shiro Usuda, the fourth son of a large family who is rumored to be a child prodigy and well known in the neighborhood, is a cool person, but today he was in a good mood and happy at the planetarium viewing with his whole family. The next day, Shiro is approached by his classmate Hoshiya. Apparently, she loves stories about stars and was happy to see Shiro at the planetarium. Shiro is impressed by the stories in a field he is not familiar with, and Hoshiya talks to him gruffly. Shiro is puzzled by the daily routine, but one day, he has to turn down Hoshiya's forceful invitation. -One day, however, he has to turn down her aggressive advances...and then, Hoshiya's mother starts yelling at him for being bullied by Shiro! (This is the fifth spin-off from the "Big Male Family" series.

神童と噂され近所でも評判の大家族の四男・兎田士郎は、クールな性格ながらも今日は家族そろってのプラネタリウム観覧でご機嫌に幸せ気分ですごせた。そんな士郎に次の日、クラスメイトの星夜が声をかけてくる。どうやら星のお話が大好きで、プラネタリウムで見かけた士郎に嬉しくなったらしい。知らない分野のお話に感心する士郎にガツガツと話す星夜。毎日のことに戸惑いながらも付き合う士郎だったがある日、星夜の強引な誘いを断ることになる。―そして、星夜の母親が士郎にいじめられたとどなりこんできて!?「男系大家族シリーズ」のスピンオフ第5弾。