How to Love a Crybaby Monster

Darryl loves Big Sister Mirisu♡♡♡ Big Sister is the only one in the world who loves him♡♡♡♡♡ However, Mirisu is worried that Darryl will not be able to settle down if things continue like this, so she lies to him and tells him that she is getting married in order to get him to leave his sister behind. When her cute little brother hears this news...